DigitBlues

I have similar situation when I try to use BA to install Melodyne through the  Add-On.  The screen just showed grey-out app and install check boxes. Clicking those produce no download activities.  I later discovered that I have to delete the entry in the registry to let BA not to think the App is already installed.

Open the Registry Editor

- Computer

HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Cakewalk\Installers

then examine the key listing under installers and identify the one that is not running/not on your computer or not installed successfully by you.  That key could be the one that BA thought it has already been installed and therefore not download.  I found one that has no value set and deleted it.  After the removal BA installed the App without problem.  I hope this is your problem too.

I have exactly the same problem reported by Marcello.  This problem re-surface a year later.  I hope Bandlab staff is able to look into their server again.

Peter