1. You need to aquire .NET Core from microsoft's website (https://dotnet.microsoft.com/download/dotnet-core), make sure to download the correct version for your operating system (Windows x64 for most users, but please check this).

2. Download the DepotDownloader tool from github (https://github.com/SteamRE/DepotDownloader/releases) and extract it somewhere you'll remember.

3. Open the folder containing "DepotDownloader.dll", type "cmd.exe" into the address bar and press enter to launch command line from that location.

4. Now you can enter the commands to download the downpatched files.

dotnet DepotDownloader.dll -app 1147750 -depot 1147751 -manifest 5243640710114192967 -username (insert username here) -password (insert password here)

5. Now once that finishes downloading, make a .txt in the folder in the newly downloaded 1.0 Fishy folder, Name it "steam_appid" without the " in it, Now type in "1147750" without the " in it and save.

Congrats you just installed Fishy 1.0!!!!

Credit to the Hollow Knight discord for most of this info