Erk! Not sure how you managed to go so deep in the hole (unless, as I suspect, you're in the tycoon mode?) That's a new one on me, and I can't figure out why it might have stalled.
My own CDs were unusable when I came to reinstall, but as I've already purchased 3 copies of the game over the years (and lost all but one set of the discs in the process), I wasn't averse to finding an... alternative to installing off the discs, shall we say?
I found a site that provided a repack of TM + S&E that had been optimised for Windows 10, downloaded and installed that and that's the version I've been using. I didn't suffer any of the frequently mentioned issues with TM under Win10 (such as black costumes, rendered footage coming out black and the aforementioned unlock problem), and it's been working fine for me since. I tried the 4gb patch but can't get it to work, not that it seems to cause too much of a problem anyway to be honest.
I can PM you the link and you could try that? It's just over a 2gb download all told, as I recall...
I also installed the 1.1 patch and the no-CD "fix" to get around the not-being-able-to-read-the-CD-problem caused by installing it from a drive rather than the discs and it's been running fine for me; the only issues I had were what I presume are file corruption issues with my data folder backups (which did come off an old disc that'd been hanging around in a box on a shelf for a number of years because the boot sector was screwed), but as most of my old projects are pretty much dead anyway, starting from scratch wasn't a major issue for me.