Hey guys, rondayvoo here (can't post on my account). For anyone who's running
SoloStone, the singleplayer offline Hearthstone client, I've been able to get mods to work through this method:
1. Install SoloStone and launch it once to check if it's working.
2. Download, install and open Special K.
3. Click on the Settings tab within Special K, then expand the section titled "Whitelist / Blacklist". Paste "SoloStone\\" in the text box titled "Whitelist Patterns".
4. Back on the Library tab, click "Special K" in the list on the right and click the start service button.
5. Launch SoloStone.exe, and uncheck "Check for updates". Click Play. You might need to do this more than once if there's an error.
6. This should create new folders "SoloStone.exe" and "Solostone" inside the Special K install location. "Solostone" is the one we want to use for injection.
7. Navigate to [Special K install path]\SpecialK\Profiles\Solostone\SK_Res\inject\textures (create new folders if they don't exist)
8. Unzip any of the packs from this thread and place the files anywhere inside the "textures" folder (you can sort with folders)
9. Launch the game again with Special K running and the textures should be replaced! (you can check if Special K is running by pressing Ctrl+Shift+Backspace)
You can also use your existing Hearthstone profile by renaming your Hearthstone profile to Solostone if you already have one.