INSTALLATION GUIDE VIDEO: https://www.youtube.com/watch?v=EgJ5WJJnSHk
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INSTALLATION GUIDE:

As of writing this, I'm not a MAC user. My only use of a MAC is making this tutorial.

Download DeltaPatcher for windows. Yes, Windows...even though it's on a MAC.
Delta Patcher Website: https://github.com/marco-calautti/DeltaPatcher

Download Steam for windows. Don't click the main button to download it. Click the small Windows icon below it.
Steam Website: https://store.steampowered.com/about/

Download Whisky
Whisky Website: https://getwhisky.app/

Drag and drop the Whisky program into your Applications folder if it's not already there.

Run Whisky

Click the gold button "Create Bottle"
Choose a name for the "Bottle Name" - Mine is 'steambox' in the video.
For the "Windows version" select "Windows 8.1"
Click the gold button "Create"

Wait for it to finish creating the Bottle

Close and reopen Whisky. The "Run" button might not work otherwise.

If you click the "Run" button in the bottom right corner, it should pop up a window like a file explorer.

Open the DeltaPatcher file that you downloaded earlier.
Drag and drop the DeltaPatcher.exe into the Whisky file explorer.

Drag and drop the SteamSetup.exe into the file explorer

Run the SteamSetup.exe while inside the Whisky file explorer.

Log into Steam, and navigate to your LIBRARY.
Click Undertale on the left tab.
Install Undertale.

Right click Undertale in your list of games. Hover over "Manage" and click "Browse local files"
Open up the file you first downloaded of the Repent to Jesus mod
Copy and paste the splash.png into this window. If it's done correctly, it should ask if you want to replace the current file. Click yes.

About four files down from the top of the list that you dragged the splash.png into, there should be a file called "data.win"

Go back to your Whisky file explorer, open the DeltaPatcher.exe from earlier
There should be two files that it's requesting: "Original file" and "XDelta patch"

Drag and drop that "data.win" from earlier into the "Original file" section

Open up the file you first downloaded of the Repent to Jesus mod
Drag and drop the repentv3_04.xdelta into the "XDelta patch" section
(the file name you have may be different, but it should end in '.xdelta')

Click "Apply Patch"

Now when you want to play it, open up Steam again in Whisky and navigate to Undertale in your Steam library.
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It should be done!

If there's anything in the mod that
causes you to stumble, please let me know.
Come talk to me on Twitch, I usually stream Monday through Friday (Lord-willing)
Twitch Username: "repenttojesus"
