It works fine in S14. Just download the file from the page you mentioned above,
Direct Link - https://daw.one/wp-content/uploads/2016/03/128_256_512_Quantize_Programs.zip
and place the 3 included files in your user data folder as it says on the web page you referenced, which will give you 1/128, 1/256, 1/512
"Custom presets are stored on your computer in the Studio One user data folder (Studio One ► Options ► Locations ► User Data) within the folder User Presets\Quantize Settings"
for example mine is H\Music\Studio One 3\Presets\User Presets\Quantize Settings
(Even though my path says Studio One 3, that is just because it was during S13's life cycle that I installed them, they still work fine in S14)
and away you go.