I get an error when I launch the program

http://prntscr.com/iig0jg

I will transalte because it's in Italian. When it tries to download the miners the error is: Invoke-WebRequest : The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel

and then all the rest...

I tried the program on 2 different computers. On both I have the same error.

how can I fix it?