https://community.graphisoft.com/t5/Installation-update/Can-t-open-AC-15-now/m-p/183824#M19986 <DIV class="actalk-migrated-content"><T>Anyone know why I can't open AC 15 after installing 16? Tough to track down as I've changed computers and both OS and AC versions all in one shot. I get the following two messages in succession:</T></DIV><BR /><IMG src="http://community.graphisoft.com/t5/image/serverpage/image-id/72071iAF2CCFF2FAAFFDEA/image-size/large?v=v2&amp;px=999" border="0" alt="AC 15 Can't Start.jpg" title="AC 15 Can't Start.jpg" /> Fri, 17 Aug 2012 21:16:41 GMT Dave Jochum 2012-08-17T21:16:41Z https://community.graphisoft.com/t5/Installation-update/Can-t-open-AC-15-now/m-p/183824#M19986 <DIV class="actalk-migrated-content"><T>Anyone know why I can't open AC 15 after installing 16? Tough to track down as I've changed computers and both OS and AC versions all in one shot. I get the following two messages in succession:</T></DIV><BR /><IMG src="http://community.graphisoft.com/t5/image/serverpage/image-id/72071iAF2CCFF2FAAFFDEA/image-size/large?v=v2&amp;px=999" border="0" alt="AC 15 Can't Start.jpg" title="AC 15 Can't Start.jpg" /> Fri, 17 Aug 2012 21:16:41 GMT https://community.graphisoft.com/t5/Installation-update/Can-t-open-AC-15-now/m-p/183824#M19986 Dave Jochum 2012-08-17T21:16:41Z https://community.graphisoft.com/t5/Installation-update/Can-t-open-AC-15-now/m-p/183825#M19987 Second message: Fri, 17 Aug 2012 21:17:20 GMT https://community.graphisoft.com/t5/Installation-update/Can-t-open-AC-15-now/m-p/183825#M19987 Dave Jochum 2012-08-17T21:17:20Z