There is some additional information you want to check out before starting the migration:
1. Read up on the configuration backup & restore here: https://helpcenter.veeam.com/docs/backu ... tml?ver=95
2. Check out some important information on upgrading from 9.0 to 9.5: https://helpcenter.veeam.com/docs/backu ... tml?ver=95
Especially the part about SQL is important
I believe it is possible, and I am sure some of my colleagues will agree or deny it (never did it myself) but from the documentation (second link at the bottom) it stated that you can uninstall the previous version and install the latest version and then connect to the configuration database so.