Dear O. Dariusz,
About 1) and 2), we will update the quickstart in the future. Now you can remove modules of other template manually in Module manager. About our account, please remove them in your database.
"unless each file (jpeg), which shows the position of the modules is not current. The names of the modules that are written on the 'preview' are probably from J1.5. (?)"
=> Could you please send screenshot?
Thanks