Tools for excel Version saying COT not installed

Trailing Tools for excel and have it installed on a Win 7 machine running excel 2013. Installed fine but it is saying "Code On Time is not installed on this computer" but I have COT 8.5.7 installed.

I see there was an issue back in 1.0.8 but I assume this has been resolved? Any ideas how to get around the issue?
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