Adobe Acrobat Pro X Crashes Upon Startup In macos Sierra 12.6

Ok, just discoeved something thst might explain it, and of what I describe might help;

What I do remeber was that all the cs5 and 5.5 apps that I first bought came on one disc, with a serial number, and the Adobe Acrobat Pro came on its own dosc with its own serial number.

I downloaded the cs6 (cs6 was an upgrade I bought online from cs5.5, in a dowloadeable file form, from my products section in my Adobe account, and then went through a difficult install. I got all the apps installed along with Acrobat X Pro. I only had to inpout one serial number for all the apps including Acrobat X pro, since there was only one dmg file for everything, unlike the orginal discs. I installed all from that dmg file, thinking the one serial number would work, or so it seemed.

I took another look at my products section, and noticed that there is an Acrobat Pro 9, with its own serial number.

Maybe I need to uninstall the Acrobat Pro X from the cs6 apps folder?, and then download the dmg file from my Adobe account and install Acrobat 9, on my computer. If I do this, will I need to go through  an offline activation process like I had to with my cs6 apps?

Or can I have both Acrobat Pro X and Acrobat Pro 9 installed?