[=;324165]
No, no, i think i didn’t explain myself sorry. The engine works perfect, loading the project also works perfect from the launcher. The problem i get is trying to download/install anything from within the launcher: being it the engine, the substance plugin or any other file (any marketplace item or learn tab item). So that’s why i said is a launcher problem not an specific problem related to the 4.8.1 update 
Right now i’m still trying to download/install the substance plugin and am unable to, always getting the same error. Maybe my launcher installation got corrupted or something?
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It is possible, try downloading something from the Learn tab. For example, . Are you able to do this or do you experience the same download error? Are you behind any proxy that could be causing an interruption? Have you tried the steps listed in our troubleshooting guide here to see if any of them address the specific error you are seeing?