@PBZ 

This might help:

https://support.zemax.com/hc/en-us/articles/1500005577342-OpticStudio-Legacy-Version-System-Requirements

Also you will need an installer (an executable file) and the following excerpt from the Ansys Software Release Policy might be relevant:

Availability of Software Releases: we provide access to previous releases of our software that are up to two (2) years old with respect to the current version. After two (2) years it will be removed from the website and will no longer be provided.

I have underlined the part that’s important. As I mentioned previously, some people had some luck asking about installers on Reddit (r/Optics):

https://www.reddit.com/r/Optics/comments/etdoyd/old_versions_of_zemax_opticstudio_installer/

Good luck with your installation and take care,

David

Hi David,

Thanks very much for your reply, in particular in pointing me to the reddit community who were able to assist me in locating old installer files for which my license is valid. From there Zemax support were willing to provide me with the applicable license code, so all is up and running well.

Hello

I am facing a similar issue with the legacy version of OS. Due to problems with OS freezing while saving file on my laptop #1 I want to install the same OS (23.2.1) on my laptop #2 and test the OS on this laptop. Where can I find the download of this version?

I don’t have an ANSYS account and it seems like a nightmare to create one: how can registration form ask for the customer number if this customer is not yet a customer?

Thanks, Dusan