Ive been playing on sevtech ages with my friend and in order to progress we need to make propene, after inputting the naphtha and steam into the chemical mixer (with the blueprint inside) it says no matching recipes found. took a look in the recipes folder just to find it empty.
(sevtech ages 3.0.8 mc vers:1.12.2)

Assuming a re-download of the pack doesn't resolve it, that's something to report to SevTech. We don't make the recipes, so if there's no recipe in the folder...

Alright, Im guessing as its server sided i should just use the default config folder they provide with the server pack?

It's both-sided. You need it on both sides. If that didn't download on your client, though, you should really try redownloading the pack since there's likely other things wrong, too.

Or, it's an actual bug and should report to SevTech.