Auran's 'PB Tank Interior' and misc question

I mean it's pretty cheap on eBay for the Deluxe 4CD set, but I'm not sure if SP2 is stable. TRS2004 apparently needs its service patches to function, so while for 06 apparently it doesn't matter as much you want to try to get the latest version. I have found used copies of TCC for $20, thing with used versions of Trainz is you can't register them. If you need more help PM me