The following text is from answers.microsoft.com https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/how-to-install-quicktime-on-a-pc-with-windows-10/95f13c0a-b593-4022-ba27-1cd18b255a9b
Please follow below steps and check if it helps.
To find out if you have multiple versions of QTMLClient on your drives do the following:
Click "Start" --> "Search". On the left bottom click "Click here to use Search Companion". In the upcoming window click "More advanced options" and select "Search system folders", "Search hidden files and folders" and "Search subfolders". In "All or part of the filename" enter "qtmlclient.dll" and click the "Search button.
You should find at least one version of the file QTMLClient.dll in C:\Program Files\Quicktime\QTSystem. If you find other versions beside C:\Program Files\Quicktime\QTSystem rename those versions. Be cautious and do not delete the other versions, just rename them for a test and reboot the system. Start Listening Singing(Music Teacher again. If you then get problems with other programs re-rename the renamed version back to the original name, other programs may need this older versions.
Some older versions did install the program data in the virtual store of Windows Vista. Unfortunately, Windows un-install does not remove this data. Thus, the program is trying to start with the old incompatible data: and stops working immediately. If you face this problem, delete the appropriate data store:
In a Windows-Explorer navigate to \Users\<Your Username>\AppData\Local\VirtualStore\ProgramData
If the folder AppData is not visible in the Explorer, then you must first un-hide the folder by turning off the "hidden folders" feature under the Edit menu >Folder Options. After deleting the directory, don't forget to hide the "hidden folders" again.
Check if a folder named AlgorithmsAndDatastructures is present in the ProgramData directory.
If the directory AlgorithmsAndDatastructures exits, then this directory was mistakenly created by an older version of the program. Delete all directories and files under AlgorithmsAndDatastructures, and then delete the directory AlgorithmsAndDatastructures.
Start the program that stopped working again: it should now start (no re-boot or re-installation should be necessary).
Some language settings confuse the program. If the program shows an error message "EConvertError: Invalid date", then try the following (Windows):
Create a new local login user on your system: e. g. "User English". (Change PC Settings > Accounts > Other Account ; Click "Add an account", click "Sign in without a microsoft account"; Choose "Local account").
Login as this new user
Open Regional and Language Options by clicking the Start button Picture of the Start button, clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.
Click the Keyboards and Languages tab.
Under Display language, choose English from the list, and then click OK.
To test if the program, which uses OpenAL, has latency, do the following:
Payment permits continued use of this version of the installed software on the computer the software was installed and access to all lessons. There is no warranty on the software. The tracking down of errors on other machines than ours is far too complicated. If you discover a software fault, please notify us.
In short, by paying you are allowed to use the program as it is, as long as the program works (e. g. operating system changes may make the program unusable).
Unfortunately, this version does not contain a print feature; you must make hard copies of the windows (use the application grab from the utilities folder). The songs and exercises may be printed from other applications, which can read abc-music notation. The songs can be found in the lessons directories (right-click the application icon and choose “Show Package Contents”. In the new window navigate to “Contents” and “Resources” and then double click on the desired lesson folder).
In today’s modern world, where everybody can sue everybody for everything, one has to be cautious. Assume you are a super soprano, and you can break glassware just by singing. Please do not blame Listening Singing Teacher for such achievements; we are not willing to pay for that. Even worse, if you are a bass singer, which could destroy Jericho (hopefully you do not live in New York) … You get the idea! Software is very complex, and computers are configured in different ways (and maybe have some problems on there own, it may even be important in which order you installed software), we cannot predict the behavior of the program. Therefore the risks to download, install or run the software is all at your risk. If you are very insecure and think if you stay at home all the time then you are safe, okay. If you fear that this software can destroy your computer or data on your computer: do not download, install or run this software. We really cannot guarantee that the server from where you download the software has not been hacked or that during the transmission no manipulations were made.
Nothing. You break the rules. Please be fair, a singing lesson of an hour with a real teacher, costs approximately the same as the license for this program. Of course a real teacher can get you additional important feedback on your posture, the breathing and other things, so you cannot compare the two approaches with each other. Many people will try this program for free, and they are allowed to do so: for ten hours (programs LST, LMT) or 100 days (programs LET, TCR, SPP). If you still use the program after that time limit, it seems that the software is useful to you: therefore paying is only fair.
There is no support hotline. However we are interested in improving the product. If you find errors or experience program crashes, let us know. Tell us also about documentation errors, sound errors or any other improvement possibilities of the program. If the program stops unexpectedly, see in the system console log for error messages. If the problem can be documented by the recording, export the recording and send the recording along with an error description.
Check if you can download a newer version with the same major version number. If so, back up your old version, before installing the newer version and try to reproduce the error with the new version.
If you get no or a wrong pitch responses from the program, please check in the replay mode what was recorded. If nothing gets recorded, check the sound control panel if the default input device is working correctly. If the input level is too low, increase it with the slider. If this does not work, you may have a microphone, which is not suited for that input channel. Expensive microphones often need special pre-amplifiers! The input channel must support microphones, line-in input channels expect a higher voltage signal than what you will get from microphones. There may also be a separate control panel for your digitizing device to adjust the sensitivity, check your hardware manuals. If you hear a lot of background noise, make sure nothing else is disturbing you. If there are clicks, chirps or hissing hearable, you might have unshielded microphone cables, which pick up electro-smog, or the microphone itself picks up a grumble from the 50/60 Hz power outlets. Try to reposition the microphone/cables. Make sure that the loudness display is in a correct range. If you make no sound, the sound control panel should show zero input level indicator lights or a maximum of two. If everything seems to be in a good range then make a hardcopy of the particular situation and export the recording, before mailing.
Send all the information (e. g. Computer Model, RAM, graphic card, audio equipment, etc.) you think might be helpful in resolving the problem to the address given in the Contact page.
No. You only have to be online for the download and the activation of the serial number.
In the applications Utility Folder open “Audio Midi Setup”, and Select the “Audio Devices” Tab. From the “Default Input” Drop down Menu choose your microphone and in the “Properties For” also choose your microphone (see below). Drag the slider on the bottom of “Audio Input” to the right. Also make sure that the selected format is 44100.0 HZ and one channel 16 bit (1ch-16bit).
Other audio applications (e. g. GarageBand) may reset the input level, the frequency or the 16bit setting to 8bit. Be sure to check and set the following settings correctly:
Audio Input Format for the default input device: Frequency: 44100 Hz; 1 Channel; 16 bit
In the applications Utility Folder open “Audio Midi Setup”, and Select the “Audio Devices” Tab. From the “Default Input” Drop down Menu choose your microphone and in the “Properties For” also choose your microphone (see below). Drag the slider on the bottom of “Audio Input” to the right. Also make sure that the selected format is 44100.0 HZ and one channel 16 bit (1ch-16bit).
Other audio applications (e. g. GarageBand) may reset the input level, the frequency or the 16bit setting to 8bit. Be sure to check and set the following settings correctly:
In the control panel choose "Harware and Sound".
Click on "Manage audio devices".
Select the "Recording"-tab.
Highlight the microphone and click "Properties".
In the up-coming "Microphone Properties" Window, select the "Advanced"-tab.
Make sure that the default format is set to "2 channel, 16 bit, 44100 HZ" and in the Exclusive Mode Section both features are set.
If you have more than one input device, make sure thet in the recording -tab the Mikrofon is set as the default.
If the input is too low, click the "Levels"-tab in the "Microphone Properties" Window, and then move the slider to the right.
Unfortunately, the manual activation is a little bit complicated. There are three different numbers:
Please do not confuse these three numbers.
Here are instructions that illustrate the process of a manual activation:
After an update it may be that the program tells you that you only have a "Trial-Version". In this case try the following steps:
Macintosh users using macOS's prior to macOS Sierra (10.12), please download the 32 bit version:
Same ListeningSingingTeacher V1.83 Macintosh (dmg)If you still have problems reactivating your program, please let us know by sending us an email and your serial number.