Hello!

This was  answered earlier in an email to support, but I wanted to reply here in case anybody else sees it. The fix in this case was to start Opticstudio the first time by opening the shortcut as 'administrator' It can also be caused by a permission error in the user account's Documents, as the default license information is stored in Opticstudio.cfg and defaults to Documents\zemax\configs. If that folder cannot be written to by Opticstudio it cannot start. Typically Documents is read. write for any user, even non-administrators. But sometimes Documents is configured on a network share, orr cloud storage like Onedrive and Opticstudio cannot write to the folder. The fix is to have IT check folder permissions on Documents, or move the default Opticstudio DATA folder somewhere else outside Documents, like Downloads\zemax. If Opticstudio won't start there is a method to change the DATA folder here: 

https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01532#Resetting