With the help of Alien BOB from https://slackware.nl/, I go to this solution:
Download an ISO with your preferred desktop from https://slackware.nl/slackware-live/latest/
Login to live environment (user and password are: root)
Proceed with setting up normally (install command: setup2hd)
Select Install from ftp/http server
Set the first path to https://slackware.nl/slackware/slackware64-14.2/ for the 14.2 release
Set the package path to slackware64
Proceed with the installation normally
