From your error log, I see you are using an outdated version of Couatl.exe, because you opted to skip the last a major update that required to download and install the latest Stand-Alone Addon Manager.
I think the error message also told you to download and install the latest Stand-Alone Addon Manager, which will surely fix the problem.
If you already done that, be sure you turn the antivirus off when installing, because if the antivirus is bugged and mistakenly blocks the installation of the new .exe, you will be stuck with the outdated version, which will cause the error.