@nc50lc
Thank you so much for the detailed reply.
To prevent any issues and hopefully have things run smoothly, I've plugged in a 1TB SSD and will just download the entire thing.
I've purged all instances/files related to Bitcoin Core - and then re installed.
I've unchecked all "purged" options, and once fully downloaded/synced.
I'm going to place the .dat directly into the folder instead of trying to restore.
Hopefully I'm following all advice correctly + will have no issues.