DCS 1.5.8 to 2.5.0 upgrade questions?

I want to try DCS 2.5, just to see how it will perform on my laptop. I have two questions:

1. Can I have separate 1.5.8 and 2.5.0 installs?

2. If not, can I downgrade from 2.5.0 to 1.5.8 if nessacary?

I will recommend what I did.

I backed up the DCS folder in the saved games folder under my user name.

Then I installed DCS 2.5 on Steam (I have 1.5.8. in stand alone)

Tested it, saw it was too much for my current rig, and I uninstalled it. If you just want to check the viability of the build in your hardware, you don't need to import all the mudles, just fly around for 20 min in amy of the free flight instant missions availables for either the Su25T or the TF51

Cheers!