Weekend go live failing with error related to data dictionaries

Migrating from 2018 Advanced to 2022 Premium. 

I need to re-migrate system files, due to changes made in 2018 since the pilot upgrade began. 

The migration always seems to fail on the providex.dcl file, followed by a message stating that Providex dictionaries files failed to copy. Migration will now exit. 

Anyone come across this particular scenario before, or know what the providex.dcl file does?

Thanks