I downloaded the file as described but I am still getting the Coualt scripting engine message error message when I start up the coualt manually.
It's not very clear if with "downloaded the file as described", you mean the file linked on my previous post, which is the MS VC++ Redistributable Runtime, which caused an error message completely different than yours ( see the screenshot of the OP ), and of course it doesn't apply at all to your case.
Your problem seems to be you have created an Couatl_MSFS.INI file for diagnostic reasons, that instead of containing the correct line:
logFile=couatl.log
seems to contain THE LOG ITSELF, as if you took a log file and copied it over the Couatl_MSFS.INI file, this is shown in your error message, which says it found a line that is normally contained in a LOG, but for some reason is found in the .INI, something that can only happen if you copied over the log over the ini.
Removing the Couatl_MSFS.INI file will surely fix this message.