i used QVPE 9.0 several months ago. Today, I upgraded to QVPE 10.0. I understand that if you have used all four of your recoveries that you can't open the old file created wtih 9.0. However, when i create a new file in QVPE 10 and save it, I still get the message that I have used all my recoveries when I try to open the file I just created with OVPE 10. How do I save new files that I can open!!!
First, make sure you have downloaded the latest version of QlikView 10 SR4 (Build 9274) that fixes a lot of issues and should allow you to open that file just fine, if you don't want to upgrade to QlikView 11.
If that doesn't work, then uninstall QlikView 9 and delete all registry keys with "qlikview" or "qliktech" in them. After that you should be able to install version 10 and open those files.