I purchased stabilizer, video essentials, video essentials II and III and installed them all the same way. They all show up in After Effects but in Premeir no stabilizer but all the video essentals appear. I installed them the same way, am I missing something? I have attached two screen captures of both. Thanks

First of all, make sure you're installing the most current version from the download page. Then make sure you choose the 64-bit Adobe Premiere option for CS5. That version is currently running in CS5 on my machine.