I found my letter! It is the directions on how to clean install Cakewalk. This is from Support (Mike).......
"To completely remove all Cakewalk software from your computer and reinstall it, follow the steps below.
Please note that this will remove any effects presets and key bindings you may have made in your Cakewalk software. You can back these up separately if you like, using Utilities menu > Cakewalk Plug-in Manager, Edit > Preferences > Customization > Keyboard Shortcuts and Edit > Preferences > Customization > Colors.
1) Run all Cakewalk uninstallers. This is normally done by utilizing the Add/Remove programs tool from the Control Panel. BandLab Assistant and the previous Cakewalk Command Center also have uninstall options within their respective programs.
2) After the uninstall process is complete, open the Run Prompt. In Windows 7, 8, and 10, this can be done by holding down the “Windows” key and pressing “R” on the keyboard.
3) At the Prompt, type regedit and click [OK].
4) Click [Yes] if asked to allow the program to make changes to your computer.
Important: When you access the Registry Editor, create a backup by going to File > Export. In the Export Registry File window that comes up, make sure “Export range” is set to “All” and that “Save as type” is set to “Registration Files (*.reg)”. It is very important to create a backup of your registry because if you accidentally delete a registry key, there is no undo function. You can, however, double-click on the Registry backup you made above to re-import your registry keys if you make any mistakes. You must re-import your backup (if needed) before restarting your computer.
5) Delete the following Registry keys. If you do not have one of the Registry keys below, simply proceed to the next one on the list.
HKEY_CURRENT_USER\Software\Cakewalk Music Software
HKEY_LOCAL_MACHINE\Software\Cakewalk Music Software
HKEY_LOCAL_MACHINE\Software\Wow6432Node\Cakewalk Music Software
6) Open the Run Prompt again.
7) Copy and paste %appdata% into the prompt and click [OK]. On Windows 7, 8, and 10, the “AppData\Roaming” folder will open.
8) Right-click on the Cakewalk folder and select “Delete”.
9) Open the following directories and delete their contents:
10) At this point, you can reinstall your Cakewalk software via BandLab Assistant.
Note: Any products from 2015-2017 should be available to install via the previous Cakewalk Command Center, while older programs may need the original install disc.
We're actually updating some parts of the program to not rely on the older redistributables, as some of those parts were originally built with those in mind. Now that we're doing quite a bit of cleanup work, that particular issue should not come back in the future!
In any event, if you have any questions or need help along the way, please do get in touch and we'll always be happy to help."