SAI download here (same version I use myself and I uploaded it myself, full version not trial, the site is safe, USE ADBLOCK, if you get a virus bc you clicked on an ad it’s on you)

it’s a rar file so you’ll need a program like winrar (it’s free)(or use another program I don’t care but I can’t assure it will extract correctly) to extract the files, once you extract them DON’T remove any file from the folder it creates, just find the file named “sai”/”sai.exe” w/e and make a shortcut to it on your desktop or wherever you want

if the program doesn’t work, right click on sai icon > properties > compatibility > run this program in compatibility for [select windows vista from dropdown]

after this if the program doesn’t work for you I can’t help

doesn’t run on Mac as far as I know

also if your brushes aren’t saving after you shut down the program it’s probably because you’re working on sai from the rar file without extracting it first, if it’s not this then I have no idea

if pen pressure doesn’t work try restarting your computer, if it still doesn’t work there might be a compatibility problem with your pen driver/windows version or some other sort of conflict, try looking via google for a patch or a way to fix it!

(in my SAI folder there might be a lot of useless cv_something files that only make the folder bigger, sometimes more pile up as you use it, be careful when deleting stuff but you can delete several of those, SAI folder shouldn’t be bigger than 23 ish MB