You can actually try link posted above on this page (by Heliosaurus). Seems like it may be working even more stable or something like that. But for posterity here is the original "Maitetsu 18+ Demosaic Steam Patch - v0.9a.7z".
md5 hash of the 7z archive: b58e7afde744b712e41fa90af2cd4d19 https://drive.google.com/file/d/1hGf0azOeBsZI6DvruBdAywjRZxqajyHE
It's my re-upload, so if something is wrong I'll take it down.