https://www.curseforge.com/wow/addons/maxdps-rotation-helper

So I know MegaMacro only technically supports a few addons but I came to plead the case for supporting MaxDPS Rotation Helper :p

It highlights a button on your bar that should be cast next. Buuut. it doesn't work with mega macros. It works with macros as long as there is a #showtooltip {spellname} line, which I do have in my mega macros. But no highlighting occurs. It does work if I drag the spell straight from spellbook onto my actionbar.

Quote from KestrelWild on Curse.

I hear this works now. Reopen if it doesn't.