pretty sure ?.. often users don’t checking that all files are deleted , as the FAQ mentioned.
We have some cases where users need to start the application with admin rights. May be because the users started the app one time with admin-rights and somewhat goes wrong with the rights , or a add-on do somewhat wrong, or these Linker do strange things… who knows.
Ah… and here I also found a topic: Game wont start - #17 by MichaMMA ( finally a reinstall help here the user )