Hi

My subscription version of Autocad13Lt on my Yosemite 10.10.5 iMac (only 5 months old) is very unstable - won't stay open for more than a minute. Tried removing and re-installing version from my subscription account but it thinks I have an earlier version of Yosemite than I actually do have and won't finish installing. 

I re-found an old link to Autocad13Lt with Servive Pack 2 which does install but is just as unstable.

Can anyone help?

Oliver