Please before posting anything make sure you are playing the mod using WSE and its own .exe .
If you have invisible horse caparison bug, it means youre not using WSE and its not a bug.
Also as stated several times in comments and mod description, guns are work in progress, so if you are trying to buy guns from gunsmith dont bother, they will be bugged. Also you wont get help from me if youre trying to add them to the game by editing txt files. I will add them eventually, most probably in the full version.
And if you experience a bug causing the lords to attack you when trying to help them escape from dungeon. Its a native bug and its not on my end. If you experience that bug , before helping the lord escape, save your game and if he turns hostile quit the game without saving and restart the game it will fix it.