Packaged EXE will not run (No errors/warnings)

Hi, I’ve been working on a game for a couple months or so; this game works perfectly fine when tested in editor & when using the editor’s standalone game however now that I’m trying to package the game to test it like that the .exe creates no window or process when opened (the cursor spins to show it’s loading for a couple seconds, but nothing else happens). This project has been upgraded from previous version/s of unreal.

My compile log shows this but googling suggests it’s not anything of concern?:
LogWindows: Failed to load ‘shcore.dll’ (GetLastError=126)

No other errors/warnings show in editor or in the package log. I can successfully package and run an empty test project with only base UE content which suggests it’s a project issue somewhere and not a fault with my computer.
Thank you.

Log: LogPlatformFile: Not using cached read wrapperLogTaskGraph: Started task graph - Pastebin.com