debbie
Hi Amaya,
We had this problem this summer. This fails because DNA master is set to an active FTP stie, and it has to be changed to passive. But until you get an update, you don't have that option.
Kristen Butela was able to work through it, so try this. Be sure to be running as administrator as you update.
From Kristen:

I figured it out!

For a fresh install, you need to first update DNA Master from the help menu. This appears to go through successfully, and I got the message about the update being finished after restarting the program. I then restarted the program, and this is where I was getting the error messages and eventual FTP failure when retrieving helper programs.

However, I just ignored all of those messages and clicked to make them go away. After the "Retrieving Helper Programs" update finally stalled at the 3% mark and threw the ftp error message, I went back to Preferences. The Home Site button is now there, so that initial update round must have updated the Preferences panel. I just unchecked the Active FTP connection box and applied changes. I then re-updated DNA Master, and everything went through with no error messages. This is an easy work around that only takes a few extra seconds.

I'm happy to make a video and post it to the forums if that would be helpful.

Kristen