OK, first things first, Mods are not devs and we do not usually know what a code error is about, those are for the devs to decipher. Secondly, as to you getting no answers, thats probably because no one has a answer for you, again because you provided a code error that most people dont understand. Thirdly Launchbox/Bigbox work just fine since the .net core change, there were some teething issues initially, that were as always quickly fixed. The issue you seem to be having is unique to you it seems as i havent seen that error message before that i recal. It does however say, "Exception Info: System.ComponentModel.Win32Exception (5): Access is denied." so my guess would be permissions issues on your system, euther caused by specific folder/file permissions, or because a antivirus program has blocked/quarantined access to specific files/folders. Again though this is just a guess based on a error not designed for users to be able to easily understand, it will make sense to the deves, but not usually the common user.