Hey, I used google-translate to figure it out.
1) install launchpad (it's here in mobileread
https://www.mobileread.com/forums/showthread.php?t=97636). The installation process wasn't explained articulately on the page so this is what i did
-Download lpad-pkg-xxx.zip
-Take whichever install.bin file is compatible with your kindle
-Put it in your Kindle root directory
-In your kindle settings, select Update Kindle
2) put the TTS folder (That you downloaded in the polish forums) in your kindle root
3) the zip file also came with an installation.ini
put that file in your launchpad folder directory
4)Press [Shift + F + I]
-Your kindle will freak out a little bit
-you should get a message saying "Success!"
5)Restart your Kindle.
6)Try it out!
To Uninstall press [Shift + F + U]
That's what I got from google translate. There's something about "Recovery" but i didn't quite understand it. Maybe those are the originals? i dunno.