My simming is all done offline - no Steam - Old School with a disc. recently I had to reinstall FSX all on a new pc after the old one broke but forgot that - now unsupported - there would be no-one there at the other end of that phone line to activate it

I'd spent a fortune on addons for this, including a shed load of photoreal scenery - and now it all seems to be useless. I've tried GOG with no luck - can this thing ever be activated without an internet connection?