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What quartus II 9.1 edition were you installed? Is it web edition or subscription edition? Can you check it (helpàabout quartus II) in quartus II main window? To successfully install the Quartus II 9.1 sp2 patch, you should have quartus II 9.1 subscription edition installed on your PC.
Besides, do you point to correct Quartus II 9.1 directory while upgrading to quartus II 9.1sp2? If quartus II 9.1 is available in that path, then I suspect your quartus II 9.1 software might be corrupted. In fact, I faced the exactly similar issue previously.
By uninstalling the QII 9.1 & reinstall QII 9.1, I could successfuuly installing QII 9.1sp2.
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I have Quartus ii 9.1 Web edition.
& then i download 91sp2_quartus_windows.exe from altera web site.(I don,'t know it is web or subscription edition?)
Is there any web & subscription edition of Quartus ii 9.1 SP2 is available?
what is the difference between web & subscription edition from performance & features point of view ?
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