Forum Discussion
Altera_Forum
Honored Contributor
14 years agoIf You did a clean install, then You can uninstall 9.1. However it could possibly remove some global variables, so it is better to use service pack only to upgrade to 9.1sp2. Anyway, check for the newer software, because I think Your Quartus is not supported anymore:
afaik Altera supports 3 versions total -> 11.0, 10.1sp1, 10.1? I am not sure here.