What are ProductCode & UpgradeCode & GUID? How to detect if certain application/library is already i
- by claws
I've already gone through:
http://stackoverflow.com/questions/211192/check-if-the-application-is-already-installed
http://stackoverflow.com/questions/488717/detecting-if-a-program-is-already-installed-with-nsis
http://nsis.sourceforge.net/Add_uninstall_information_to_Add/Remove_Programs
My questions are little more in depth and…