Failed to load mods: Error while loading recipe prototype "maraxsis-estrogen-recipe-scrap-recycling" (recipe): Recipe has invalid main product iron-gear-wheel. The product does not exist in the recipe product list.
Modifications: Maraxsis › Rigor Module

I'll take a look. Do you have a mod installed that removes iron gears from the (normal) scrap recycling recipe?

After some testing, I am almost certain that this is not a Rigor Module issue. The recipe "maraxsis-estrogen-recipe-scrap-recycling" is copied from the Space Age "scrap-recycling" recipe by Maraxsis; I think another mod you have installed is changing the "scrap-recycling" recipe before Maraxsis copies it, in such a way that the copy ends up being invalid.

Rigor Module makes minor modifications to the recipe, but not in any way that would cause this error (all Rigor Module is doing is disallowing rigor modules for this recipe). If you uninstall Rigor Module, I expect the error would still occur.

I recommend reporting this issue to Maraxsis's author, and the author of the mod making the relevant change to the "scrap-recycling" recipe (if you can find which mod it is).

Sorry. Was trying to use unofficial maraxsis update and it used some wrong version of the mod as a base

No problem!