Hi Andrew!

OpticStudio doesn’t remove old versions automatically as many people like to have multiple versions available.

However, usually, installing Zemax/OpticStudio defaults to the same folder as the previous version, so probably you don’t have as many versions installed as listed in “Apps and features”. The reason why you can see so many versions is because Windows only shows the amount of space used when installing a new software/release, but does not update later. If you use the default settings for installation, most likely you actually have only one copy of OpticStudio installed in one folder like C:\program files\Zemax OpticStudio. If so, then new versions overwrite the old but do not remove the entry in Add/remove programs for the old version.

If you would like to cleanup old versions, the best way is to search the computer for Zemax.exe and Opticstudio.exe. Right-click the found file and select “Open file location” to open the folder it’s installed in. Then you can run the “unins000.exe” file in that folder to remove it. It is safe to delete all the old versions of OpticStudio, it will not remove or modify the license in your machine.

Best,

Csilla