It's a completely new installation, I downloaded the package again to be sure, it's not an upgrade package. The file exists as well, and has contents inside it. I had 4.0.0 RC 4 installed before that, but it was removed (VaultWiki removed, then VaultWiki Routes, then files deleted).
BTW, now when I hit Members it says:
Robust, you do not have permission to access this page. This could be due to one of several reasons:
Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.