Entering license key and site message into Toad for Oracle 2015 Suite(x64) installer returns:
You must enter a valid license and Site Message in order to continue.
The installer is not accepting the License (see below).

1. If you or your site does not own a commercial license key for Toad for Oracle; download the trial installer from the link below.
https://www.quest.com/products/toad-for-oracle/software-downloads.aspx
-OR-
Find your commercial license and Site Message and input it into the Toad for Oracle 12.7 installer instead of the above trial key to complete the installer process.