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I installed AutoCAD 2016, and was still using 2012 and 2015 for other clients of mine. I was able to use all three versions since I installed 2016 about 2 weeks ago. Now I can't run any previous versions. 2012 gives me a Fatal error. 2015 tells me either 1) This version was not installed properly or 2) You don't have sufficient rights to run AutoCAD.
A lot of users around here this week are reporting difficulties running 2015 all of a sudden: are you in subscription? If yes, log into the subscription management page, click on the support link at the top and seek direct support. Something is going on with 2015 this week.
With the migration, I believe it transferred over my customized menus and LISP programs. However, when I installed 2016 with migration, I was still able to use AutoCAD 2012 until yesterday.
.... I was able to use all three versions ... and how do I fix it?
For others who come along and discover this thread - when things are working, create Windows Restore Points.
Do it now!
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