I’m interested in upgrading but I’ve got a crappy DSL connection. If I allow the file “$Windows.~BT” to download can I copy it to a USB drive and use that file to upgrade another PC? Thanks.
I think that each computer's $Windows.~BT file is specific to it, built up over time by some app that MS has downloaded to that computer as an "update."
If that theory is correct, you cannot use the $Windows.~BT file from one computer to upgrade another.
You don't download $Windows.~BT from MS to your computer. You download an app that builds it as an update.