Okay I'll try to help anyone willing to do a little bit of work to fix this for themselves. Generally it's better to do a patch in case a mod gets updated so changes you make don't get messed up but considering if this got updated it'd mean there'd be no need to fix it for yourselves in the first place, that and explaining how to make a patch would take a lot more effort. Extremely important before we start, any time I use a capitalization in something like "Clip" be sure you use it too. And in no case do you use quotation marks, I only used them to make it easier for you to follow.

First, three things were changed in 1.4

AudioGrain_Folder was changed to AudioGrain_Clip

and I believe it was

clipFolderPath or clipfolderPath changed to clipPath

and

ToxicSensitivity was changed to ToxicResistance

So first we'll start with the easiest one. And before anything starts, use RimPy to find the mod easily. If not, google how to find where your rimworld mods are installed, it'll be easier to find than trying to google an answer how to fix this.

First, open this mods folder. Go to Defs>ThingDefs_Races> open "Races_Animal_Dragon_Group" with Notepad
in there, change "ToxicSensitivity" to "ToxicResistance" there's two mentions of it, CTRL+F if you need to find it, no quotes any time you see me use quotes of course. Close the file and save your changes.

Now go back to the Defs folder and open SoundDefs then open the Pawn_Animal_MD.xml
Use CTRL+F to find every instance of "AudioGrain_Folder" and change the word "Folder" to "Clip" and yes, keep the underscore so it would look liked "AudioGrain_Clip". While you're in this document, change every instance of "ClipFolderPath" to "clipPath", so just delete "Folder" anywhere it's mentioned in the document, again, use CTRL+F to make it quicker and to ensure you didn't miss any. Finally, updating the sounds is extremely easy but it does require another app. Go back to the beginning of the mods folders and open Sounds>Pawns>MilkDragon

Now google "convert .mp3 to .ogg". Use Convertio, can't speak for how safe other sites may be. Personally I used Audacity but that takes a bit more explanation. CTRL+A the five .mp3 files I mentioned previously and drag and drop them into Convertio. From there just follow the basic instructions, convert them to .ogg and download them. Delete the five files you had copied originally and then copy the files you just converted and paste them into the same folder that you had deleted the original five.