I do a little file copy (Windows libraries edited to my liking)

Bundle deletes ones in user space & then copies as user new ones

It always worked, suddenly on random people it gives an error:

Unexpected error installing file. Error: Access to the path 'C:\Program
is denied.

Sure, the normal user does not have access to this folder, but that does not
stop the bundle working on X other machines

So what is going on?