I don't know if this is relevant to any other software/programs, but I was banging my head against a wall trying to figure this out because none of the solutions provided in any of the threads were working and wanted to share what I have found.

My issue was not with Julia but Anaconda. I can't say this is the solution with 100% confidence since I uninstalled Anaconda to get my program to work before I discovered this but if your libstdc++-6.dll (or other .dll files) is coming from an anaconda folder, I think the issue is that Anaconda automatically downloads a PowerShell profile script to run conda.exe every time a new PowerShell is loaded, meaning that it would always try to load certain files (including the .dll files) from my anaconda folder instead of the one's defined in my PATH.