You already have the installation download. Make sure you downloaded the 8100 .alx for the OS version 22.214.171.124.
Then replacy your blackberry.alx with the new blackberry.alx. (you can rename the old one so you can get it back if you ever need it. I would just rename it blackberry.old. (you'll need to unzip the file you downloaded as it's a .zip file)
Then plug in and run DM and Apploader again. It should want to update "core" applications. Finish the installation and it should load more themes to your BB.
It's for the 126.96.36.199 package version 188.8.131.52 software version
It's a little confusing between "package version" and "software version." The package version contains the software version. The software version is listed in Options >About on your BB. Does that make sense?