Reinstalling Previous Years TT software after crash

My hard drive crashed, now repaired.  Before I install TT 2018, I would like to install previous years software...the reason is because a few years back a similar situation occurred and when I installed TT, it did not pick up the previous year info, I assume because I did not restore previous year software.  I don't want this to happen again!

The TT files from prior years are in my TT folder.  Common sense tells me that is all I need, but very paranoid to install TT 2018 until I'm certain.  Has anyone had a similar experience or have the answer on how to proceed?  I have the CD's for 2018 and previous years as well.  Appreciate any guidance.