I would really like to purchase MC 15 in lieu of Prime. I am used to MC 15 and would like to stick with what I am used to. However, I can't seem to find anywhere to buy that particular version of the software. I have a 30-day trial version that appears to be of MC 15, but when I look at the license file it says that it is Version Prime. Any insight or suggestions?
When you buy Prime you get a copy of MC15 with it. The same license file works for both. So buy Prime, install MC15.
When you purchase Prime I'm not sure how everything is delivered (I don't get mine by "conventional" channels). At a minimum, you will be able to download it from the PTC website.