You have the textures in your folder, but you need to manually create the brush. I am guessing from your screenshot you need to greate another PEN brush and then chance the settings like you see in the screenshot. That's the way you import brushes in sai. Or that's the way I do it.
I had no problem creating the brush :3
1. right click on an empty spot of your brush palette. 2. Choose Pencil and create a new one. 3. Than chance the settings and brushform and texture.
Thank you for your help but it's still not working? (idk whats wrong with my computer) Here's another image of me trying to add textures to the new pen: i.imgur.com/RZsJeBg.png Also idk what your talking about your English is amazing!
I think I have an idea. the new version of painttool sai 2 has it's folders in documents. try to look there for a folder that is called: SYSTEMAX Software Development.
your pc - documents - systemax software development - sai2 - settings. there you find the papertex and the brushtex folders. the new version od sai moves the folders to documents the first time you start ist. but it also has the folders where you installed it. a bit confusing D: but it only works in documents. try to copy them in these folders. maybe this will work