Is there any way to check who delete the process model version

Deletions

Object and plug-in deletions are recorded in a comma-separated value (CSV) file, deletion.log, in the <APPIAN_HOME>/logs directory. If an object or plug-in is deleted and you need to know when it was deleted and which user did it, you can refer to this log file.

https://docs.appian.com/suite/help/24.3/Logging.html

You can prevent deletion by setting viewer privileges on the process model.

Deletions

Object and plug-in deletions are recorded in a comma-separated value (CSV) file, deletion.log, in the <APPIAN_HOME>/logs directory. If an object or plug-in is deleted and you need to know when it was deleted and which user did it, you can refer to this log file.

https://docs.appian.com/suite/help/24.3/Logging.html

You can prevent deletion by setting viewer privileges on the process model.

Thanks, by the way is that the only way to check?

AFAIK, yes.