i've never used the addon manager. i simply cut and paste the mod files into the directory for the designated files. make sure to read the fine print on the mod page. i finally got SH4 to work with FOTRSU megamod which is similar to TWOS mod for SH5.
if you don't find it working after a good effort, completely uninstall and reinstall your sim and start over. i had to do that a few times with both SH4/5 to get it right.
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