@fieserdoo2367 - To obtain older PC version of ONYX you need to reach out to support for them and provide a reason. That said, 4.2 is a very old version and will most likely not run because of new Windows Security updates.
As an alternative, you could make a copy of the file and just load it into 4.32 and see what happens. There were some Fixture swaps that happened in 4.6 with a library change. So that might cause issues and if you can’t resolve them, maybe support can assist with that adjustment to get you a working 4.32 file.
Hope this helps,
Watson