If your Blackberry OTA is not showing the latest update on your Storm 2 manually download.  To check for OTA updates go to Options | Advanced Options  | Wireless Update.  If your running a leaked Storm 2 version the OTA will not show up and you need to do the manual install (see link below).  Manual installs are performed via Blackberry Desktop Manager.
Use Shrink-OS to remove unwanted components of the installer and free up memory to install your Blackberry Apps. Check out Brent’s Article
Download 5.0.0.607 from Verizon