I think that version 5.2 is the only version of PAF5 that is currently available. Any differences between 5.0 and 5.2 will be minimal.
This is not the case with PAF Companion. If you have a licensed version of PAF Companion earlier than 5.2 and it is working, do NOT upgrade PAF Comapanion and it should work fine, with the limitation that it does not support other languages. Upgrading PAF Companion will not solve that problem and will require purchasing a license for the upgrade. (At $6.75 USD it is a minor expense, but if the upgrade will not solve the problem it will be a waste of time and money at this point.)