I never use the online installer. I have about 20 or so Waves plugs, all purchased one by one. I have never had an issue with installing or licensing. Here is what works for me.
Download the Offline installer.
Run the installer and put a check by all the plugs you purchased.
Complete the installation.
Run the Waves licenser. (I keep all my licenses local, no iLock)
Lastly, Scan plugins in Sonar. Be sure to put a check by (scan existing plugins). The way Waveshell works, you must rescan
existing plugins for the new ones to show up.
HTH
John