Thanks Jason.
Unfortunately did not work. I again did uninstall and re-installed all extensions and as soon as I entered the serial number for e-cart lost connection to my database and now receive and unidentified error. I deleted the DW cache file and even the DW configuration folder. I also deleted/renamed the DW preference folder. Still does not work.
What is also strange that now if I try to establish a new Database - all I see is the option of a new MySQL connection despite having the MySQLi Server behavior installed which I believe should also see as an option.
Is there a specific way or order of installing each individual extension that I might have mixed up or anything else you can think of?
Best,
Joerg