Hi @k-gosciniak_5741 , We've got no clue what's causing that, but definitely some kind of IIS configuration. Ultimately I don't think the request for that file is being passed into ProGet, but IIS is trying to find the file on disk instead (which it obviously won't be). I would guess if you put a file on disk that file would be served via that URL. IT's just a guess. Other things to look at ... MIME mappings, I've seen those do strange things. Maybe there's other IIS modules. It's really hard to guess. It might just be easiest to switch to the Integrated Web Server; you can just uninstall / reinstall ProGet. That won't use IIS then. Cheers, Alana

Thank you very much for answer, keep up the good work.

Hi, Thanks for letting us know. Looks like the error message is wrong - actually the problem is caused by build metadata being present in a version number that is not a semver2 version. We've filed this as PG-1655 to make parsing these versions more permissive - it will be fixed in the next ProGet release (5.2.23), currently scheduled for Jan-17.