You can install Qlikview Personal Edition, but you won't be able to open document you created earlier. If you open a document that was created with another Qlikview installation then the you are asked if you want to recover the document. If you do that then the license number of your QV PE installation changes. The result is that you now cannot open documents you created earlier without a recovery. And you only can recover a document four times. Judging by your screenshot that has happened in your case. You can now only create new documents. You can only open the previously created document if you get a named user license.