1- Firstly, I recommend leaving the game on the most recent version.

2- In Ryujinx, right-click on the game and press 'Open Mods directory'.
Create a folder called 'witcher3banbypass' and inside it create a folder called 'exefs'.

3- Download the file: https://gbatemp.net/attachments/witcher3banfix-zip.197437/

4- Unzip it and place the file '11F23ECBDFBA7E2424FBE4372512A8F8.ips' inside the 'exefs' folder.
If you are not using Ryujinx and have an unlocked Switch, you should place the entire contents of the zip in your atmosphere folder.

It will look something like this on PC: C:\Users\YOUR_NAME_HERE\AppData\Roaming\Ryujinx\mods\contents\0100e67012924000\witcher3banbypass\exefs\11F23ECBDFBA7E2424FBE4372512A8F8.ips

5- Inside Ryujinx, go to 'Options' > 'Settings' > 'Network'
And leave the 'Guest internet Access/LAN mode' option checked and press 'Apply' and 'OK'

6- Open the game in Ryujinx, and on the game's home screen, select 'My Rewards', do not close the game.
If it works, a website will appear to enter, which is individual for each person. You can write it in your browser or use the QR code to open it.

7- Create an account or link it with one of the options, I clicked register and created a new account with my email, you will receive a code in the email to continue.
After entering the code, it will appear that it has been linked, return to the game, it will appear that you have received the rewards and it will be possible to link the save between platforms.

8- Still in Ryujinx, load your save, pressing 'continue' or 'load'.
Inside the game, press to save manually, and press the first option to save, there will be a drawing of a cloud.
If the saves are successful, a save will appear with a drawing of a cloud, if not, check in the game options, under 'GAMEPLAY', whether the 'Progression between platforms' option is activated.

9- You can close the Ryujinx game and open the game on STEAM, it will open 'Redlauncher', click on the button below 'play' on the left side in 'my rewards'.
You will open the website again, log in with the same email or in the same way you did previously, enter the code you receive by email.

10- Open the game on Steam, and on the game's home screen, select 'My Rewards'.
Go to the save load menu, there will be your Switch save with a cloud symbol, open it and that's it.

Credits for creating ips gbatemp's Potato_of_Doom, and the M4n0Cr4zy tutorial