EDIT: I think I caught the bug -
redownload it again please.
Where do you store your track templates? The script is looking inside default REAPER\TrackTemplates folder and its sub-folders.
As of the error - it says there is no 64-bit plugin list .ini in your REAPER installation. Are you running 32-bit REAPER? If so, the script currently works with 64-bit REAPER only, as noted in the original post.