I third this. I've tried all of the options to get TEh's Fishing Overhaul running but to no avail. I've got my hands on an old version with those Json files included and I'm attaching it here, let me know if you manage to make it work.
UPDATE: I did this
Instead of using that old version I used the latest unofficial version during the first launch, closed the game and pasted the Json files from the attached zip. Did all the other steps listed above and now It seems to be working. I'm also running SVE + More fish.
i have tried this method couldnt get new jsons to regen. i am mostly getting a error but mod is loading}
[Teh's Fishing Overhaul] Mod crashed on entry and might not work correctly. Technical details:
System.MissingMethodException: Method not found: 'TehPers.Core.Json.IJsonApi TehPers.Core.Json.Extensions.GetJsonApi(TehPers.Core.ITehCoreApi)'.
at TehPers.FishingOverhaul.ModFishing.LoadConfigs()
at TehPers.FishingOverhaul.ModFishing.Entry(IModHelper helper)
at StardewModdingAPI.Framework.SCore.LoadMods(IModMetadata[] mods, JsonHelper jsonHelper, ContentCoordinator contentCore, ModDatabase modDatabase) in C:\source\_Stardew\SMAPI\src\SMAPI\Framework\SCore.cs:line 1546