I temporarily removed it in November 2016 (Version 7.2.2) because it caused crashes on many systems.
The Tukey test needs an additional DLL file which I never got around to adapt for the version 7 series. I’ll put this on my list of things to do next…
Sorry about that. You can install version 7.2.0 and try if the ANOVA still works on your computer. Make sure to save your data before attempting to use the ANOVA in this version! If Excel crashes, you can still re-install a current version, but will have to wait until I get the ANOVA back in.
Cf. Cannot use ANOVA posthoc tests