This is going off my head, but I would start here for these apps:

Paperless - Sage support

My Assistant - Sage support/KB release notes

Office Connector - Event1 support

It may be worth waiting until clear details on supported versions for year end are necessary to ensure you are updating to a supported version for year end.

Office Connector comes in the Sage 300 installer, my CFO was back up and running the day after our migration to 20. My Assistant has a version 20.1 download on the website, it works perfectly with Sage 20.2. 

We don't use Paperless (*yet*), sorry!

Thank you.