Brumeire

I was speeking about the perks in the archery tree ^^

I already reported this bug but after some test on the clean skyrim, I found why I was unable to enhance the crossbows : I just needed the smith steel perk ^^'

For other people who might have this bug, I solved it using those compatibility patches :) https://skyrim.nexusmods.com/mods/29375/?

Thanks to ModOrganiser, I started a new game without any mods (excepts the 3 officials dlc and Skyrim Redone), I rushed helgen, went to a forge and leveled up the marksman tree with console commands but I wasn't able to enhance the crossbows. It seems that the bug is caused by SkyRe itself :/

Ars Metallica (but I tried to disable it and still can't craft the crossbows), the armoniser armor pack and immersives armors (I use a custom ReProccer stats.xml with them)

At any forge but it seems to have some bugs with other smithing mods because I can't enhance any crossbow when I have the perks and materials :s