I have the same problem. I'm installing into Imagevue X2.8.2. I put the Exra folder in my main folder with iv-config, etc. I'm told I've successfully logged in and then that same "missing files" message appears.
I hope our problem is read and resolved by Artur and we can achieve a successful result with the PowerPack in Imagevue x2.8.3.1.
I'm sure the answer is something simple that we are overlooking ...
Again I need help ...
thanks..
Sorry guys, but I'm out of time currently.
This error is related to files security on your server.
You need to look at the files permitions and .htaccess file whether anything is blocking xml files.