Here is how to downpatch the game to the state before the dupe glitch was removed:

1. Open the Steam Console (choose the easiest for you):

• Option 1: open the Run window (win + R), type steam://open/console and press Enter.
• Option 2: create a shortcut to steam on the Desktop, right-click and go to Properties, add -console to the target, click Apply and Ok and open the shortcut.
• option 3: run steam from a console with the -console option (ie: $ steam.exe -console).

2. Paste the following command into the console and press Enter:

• for PC: download_depot 606150 606151 5258312380035980017
• for Mac: download_depot 606150 606152 4590643858612391872

The steam console will start downloading the patch, however it will give you no indication of progress so you will just have to wait it out. Once it is finished, the console will print out a line that says something along the following: Depot download complete : "C:\Program Files (x86)\Steam\steamapps\content\app_606150\depot_606151" (183 files, manifest 5258312380035980017)

3. Open the folder specified by the console and copy everything inside. There should be a folder called Cat Moonlighter_Data, and the following files: - executable called Cat Moonlighter.exe - steam_api.dll - 1.3.7 - steam_appid

4. Navigate to your Moonlighter installation directory (\Steam\steamapps\common\Moonlighter) and:

• if you want to keep the most recent update so you don't have to re-download it, make a new folder and dump all of contents inside.
• if you don't want to keep the most recent update, delete everything inside.

5. Paste the depot files into the installation directory.

6. Launch Moonlighter and enjoy! (Might take a while to launch at first)

https://discord.gg/VRefHxA

I went ahead and created a Discord server for this speedrunning community (hope that's ok :D).

Feel free to join!