I have purchased a license for pgi 6.1 but would now like to use the 6.0 compiler instead. Is it possible that a license key for 6.1 would be valid for 6.0? If not how would I go about changing the license key over?
When you purchase a license for a particular release, the license is also valid for all previous releases. So, yes the 6.1 license is valid for 6.0 as well.