1. Download Geo3D alpha 3 Installer from (https://flugan.github.io/Geo3D_alpha_3.zip)
2. Extract to folder.
3. Download zip file in this release with addon64 and addon32 and extract into the installer directory replacing the addon32 and addon64 files (eg "Geo3D alpha 3\Geo3D") (they now have a bunch of funny names, so probably better to just run the installer then replace the Geo3D.addonXX that it puts in the game folder with the ones provided below.)
4. Download reshade 6.4.1 with addon support from (https://reshade.me/downloads/ReShade_Setup_6.4.1_Addon.exe) and open the installer with 7-zip to extract the Reshade32.dll and Reshade64.dll then copy and replace those in the installer folder for ReShade (eg "Geo3D alpha 3\ReShade")
5. Lastly update the ReShade.ini file (eg "Geo3D alpha 3\ReShade\ReShade.ini") to contain your TV size in inches and the position of your trigger boxes in pixels here is an example for my LG C1 55 inch when running games at 720p. For 1080p these values would need to all be multiplied by multiplied by 1.5 then rounded to the nearest integer.

[Geo3D]
StereoConvergence=1.00
StereoScreenSize=55.0
StereoSeparation=25
TriggerBox=1
BlackBackgroundBottomRightX=40
BlackBackgroundBottomRightY=14
BlackBackgroundTopLeftX=0
BlackBackgroundTopLeftY=0
WhiteLeftBottomRightX=12
WhiteLeftBottomRightY=8
WhiteLeftTopLeftX=0
WhiteLeftTopLeftY=0
WhiteRightBottomRightX=32
WhiteRightBottomRightY=8
WhiteRightTopLeftX=20
WhiteRightTopLeftY=0

6. Install and use reshade as you normally would be sure to set your fps to be 120hz and vsync to on, you will need to reduce your graphical settings and resolution until you can get a pretty stable 120hz otherwise you will experience flickering as it relies on software pageflipping and there is no quad buffering. A recommended test title is "Penny's BIg Breakaway Demo", if one lowers all graphical settings and uses 720p it will run at 120hz consistently on amd integrated graphics. It has some issues with some shaders/textures not rendering it 3d, otherwise it appears to work fine.
7. Also you will need to make sure you disable the "3DToElse.fx" shader as it will change the page flipped output to side-by-side breaking things.
8. After confirming it works to your liking help contribute by supporting the author Flugan on his patreon https://www.patreon.com/Geo3D

If this version doesn't work you may want to try the older version here.
https://github.com/open3doled/Geo3D_old/releases/tag/v4.1.1