Version 1.x no longer works due to changes in the type of files NWS generates. No one provides those file anymore for that version.
HOWEVER .... if you upgrade to Version 1.92 (which should still be available on the GRX site), you will find an option on the Configure Polling screen to use an NWS FTP server. THAT still works and it is what I'm using.
The other option is to upgrade to version 2.x for a reduced registration fee of $40.00