I love TestCop! It's my favorite ReSharper extension.
However, that being said, the JetBrains folks like to do Continuous-Release of point releases. i have the JetBrains Toolbox app on my computer which constantly keeps ReSharper up to date.
However, as soon as ReSharper puts out a new version, testcop stops working. I've raised this issue before, but I am certain that there has to be a solution so that TestCop can "keep up" with R#.