Whatever questions you have are probably already answered here. 

You said to respec before updating but Withers won't let me!

• Read the article here on how to respec. Respec spell is an extremely easy workaround that consistently works after major patches as the way it works is very simple. Appearance Edit Enhanced is also useable for this purpose, but it is complex and sometimes needs updates. Or you can use the patch to remove the Oathbreaker tag, if you're lame. 
  

• Read the mod description.
  

• Full list is here.
  
  

• If I can do it through Script Extender as a one and done patch, sure, I probably can/will. If I have to maintain multiple files that override each other I probably won't because it's a hassle and takes up a lot of time. Please be reasonable when requesting patches and consider how much time goes into it. 
  
  If you want to make a patch or translation, or whatever, I don't care, my permissions are open. You don't have to ask, have fun. :) I only ask that you only pack the necessary files and set this one as a requirement, don't reupload the entire mod because I don't want to deal with the bug reports from an out of date version floating around. If the class needs an update after a patch (which is unlikely since it's a custom class but who knows), I will update it.
  

• There have been a few requests for this so I plan to make them available as a separate mod in the future once I'm sure I have any bugs ironed out.
  

• Please make sure you have all the requirements and that your load order is correct. If you have checked all this and read the mod descriptions of all the mods you have installed and followed their instructions, please submit a bug report. Please do not submit bug reports for issues unrelated to the mod, or issues that are already listed in Known Issues. 
  

• You are missing a requirement or your load order is incorrect. Make sure you read the documentation on all mods you're using and keep everything up to date.
  

• Yes. Profane Smite interrupts will not function correctly without it, and all spell list and optional patches are done through Script Extender because I don't like maintaining multiple files. I can confirm the mod will not crash your game if you don't have Script Extender as I have tested it myself. I tried to cut down requirements where I could so Compatibility Framework and Community Library are no longer requirements of this mod.
  

• I've tried to keep this balanced (as far as Paladin can be balanced anyway, smite go brrr), so please let me know of any balance issues and I'll try to fix them. As of 3.0 I've overhauled the class and hopefully addressed most balance issues. Most spells are modified vanilla spells and I kept damage values the same as their counterparts, but balancing is a tricky thing and actual game devs don't always get it right.
  

• Level 20 is typically played with difficulty mods. Here are some recommendations! I like to suffer but you can customize the difficulty to your liking, Combat Extender is great for that. 
  

• No it doesn't and most of your mods probably have it built in anyway. Any mods that are not simple replacers of game files like a texture or a head mesh require Mod Fixer to work, otherwise the game gets real weird. 
  

• No. If someone else wants to, I don't care, but I wanted this class to be more of a controller/debuffer. You're free to patch whatever spells you want in, of course. I don't really care. 
  
  

• You're free to make your own mod. Constructive feedback is welcome but "I just don't like this" is not constructive. Don't advise me to delete half the class and the hours spent on it because you don't like multiclassing or whatever, that's just rude. 
  

• dbzmaster12 is maintaining a compressed level 12 conversion here. Optional patches all use Script Extender so they should all still be compatible with the level 12 version. The level 12 version compresses all the abilities and spell slots into 12 levels, so don't expect it to be balanced. If you want more balanced play, you can just use my version without the level 13+ features. I tried to design it to be a complete class at 12 while gaining new toys after 12. 
  

• Mythalar patched this here.
  

• Not technically, it won't crash your game or anything but obviously you won't get any features for level 13+. Level 12 progression should be identical to Paladin in terms of spell slots. 
  

• Use Respec Spell, switch to Paladin, use the Break Oath spell, leave camp, and come back. He should be chilling. Use the Reclaim Oath spell and respec again. You can swap back to Blackguard and he'll still acknowledge you as an Oathbreaker and you can get the special Durge dialogues. No promises he'll stick around, though, he's picky like that. Easiest way is probably to just have a companion you don't use specced into level 1 Oathbreaker all the time.