If by any chance the mod is not working for some reasons try to re-equip your set for the changes to apply. If that doesn't work try adding the items with the debug console or try crafting them again.
There are mods for it, one is in his description of this mod. I personally use a mod that lets you customize Quen and Yrdens power, it comes with a slider in the mod menu to set what you want the set bonus requirement to be.
I've just noticed an issue with this mod. Everything is working fine except the bear school silver sword is not counted as one of the 6 pieces. I've checked and everything else is, but not the silver sword. I'm not high enough level to use the crossbow yet so I can't get the 6 piece bonus.
Edit: I've done some testing and it's just the base level ursine silver sword that's the issue. Once it's upgraded to at least enhanced then it's recognised and I can get the 6 piece bonus.
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If that doesn't work try adding the items with the debug console or try crafting them again.
how do you set Witcher bonus requirement from 6/6 to 1/1 ?