Setting Windows Compatability mode

on Windows 10: you must do this step, along with permitting C:/ProgramFiles/Theatre Manager in Windows Defender

You may encounter a failure to launch Theatre Manager if you are installing or upgrading Theatre Manager on a workstation running Windows.

It can be resolved by telling Windows that Theatre Manager may need to run as administrator for all users. You might see an error like below complaining about an invalid format for userpic.df1 and that it needs converting -- this is a sure sign of windows defender and the settings need to be made.

Follow the steps below

1. Right Click on the Theatre Manager icon on the desktop
2. Click properties and then FIND ORIGINAL"
3. When you find TheatreManager on your desktop and choose Properties
4. Click on the Compatibility Tab
5. Click the button to Change Settings For All Users
   • Uncheck: Run this program in compatibility mode for:
   • Check: Run this program as administrator
6. Click the button Apply