The software remains fully functional without a key; you simply click "OK" or "Close" on the reminder screen. Public Historical Keys:
If you do have a legitimate legacy key and it won't save, you must run GSview as an Administrator once to enter it. Better Modern Alternatives gsview 50 registration key
: Standard GSview 5.0 often fails to process newer PDF versions. Some users turn to unofficial patched versions available on GitHub that fix compatibility with recent Ghostscript releases. Modern Alternatives The software remains fully functional without a key;
For GSview 5.0, which I assume you are referring to with "gsview 50", here's what I can offer: gsview 50 registration key
The most useful "feature" you can implement yourself is making the registration prompt disappear permanently so you can use the viewer without interruption.