You can always ask me for update, then it comes much faster.

Sorry, I should have done that first, but I've just assembled a script to do trivial edits to support 0.17, and was having fun applying it to everything within reach.

Here was only one changing: version number. The mod has no own prototypes, but it uses existing prototypes.
Here was no item flags, gui styles, or technologies with "-1" at the name ending.

It's strange, but I cannot find this mod with "darkfrei" in the searching field
https://mods.factorio.com/query/darkfrei?version=0.17

I deprecated this (which hides it from search), as you've updated; It was only meant as a stop-gap.

It's not hidden from direct searching:
https://mods.factorio.com/query/Burn%20Barrels?version=0.17

Huh. That's what the check box said it does...