Oh I found it on their forum:
Hotfix 4.601b is published - it addresses the issue with darker Mustang windshield, fixes the 13-mm ammo loadout for Bf 109 G6 Late (there is now an AP and HE mix instead of HE only), does a couple of text corrections, updates certain Mustang, MC.202 and all Nieuport skins and adds 4K quality external textures for Yak-7b created by Martin =ICDP= Catney. Hotfix 4.601b is published - it addresses the issue with darker Mustang windshield, fixes the 13-mm ammo loadout for Bf 109 G6 Late (there is now an AP and HE mix instead of HE only), does a couple of text corrections, updates certain Mustang, MC.202 and all Nieuport skins and adds 4K quality external textures for Yak-7b created by Martin =ICDP= Catney.