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The linked version of Tellmewhen produces lua-errors. Use bkader's version instead: https://github.com/bkader/TellMeWhen_3.3.5

Some may know this from retail: https://wago.io/RaidAbilityTimeline

Or from this video: https://www.youtube.com/watch?v=7M3F0JoC3gE

Here is the backport (thanks to NoM0Re):...