Demo version?

Hi,

I am looking for a diagnostic/repair tool for my macs. I have an older Macbook pro (mid 2010) and two others (a new Macbook Pro and an iMac). My old mac frequently restarts and I need to find out if I can get it fixed. All machine run El capitan with latest updates.

I would like to know if there is a demo version of TechTool (any version) available (i.e. a limited version without repair functions and possibly limited diags) which I can try before purchasing?

And, do I understand it correctly that I will be able to install the same license on all 3 computers?

Thanks for your assistance

Claus Sternberg