First, the update packages (bin files) need to be extracted from those archives you downloaded (tar.xz). Second, they need to be installed with MRPI (mobileread package installer).
Go to the snapshots thread, download the MR Package Installer and extract the contents to the root of your Kindle. You should have two new folders:
extensions and
mrpackages.
Extract the bin files from the
tar.xz archives and place them in the mrpackages folder. Enter this in the search bar:
;log mrpi
If you need a program to extract the contents of those archives, try
7zip.
The python and linkss packages you extract should be:
Update_linkss_0.25.N_install_pw2_kt2_kv_pw3_koa_kt 3_koa2.bin
Update_python_0.15.N_install_pw2_kt2_kv_pw3_koa_kt 3_koa2.bin