Seems that using the GUI method, or manual download and gunzip successfully creates a bin file in the blocklists folder. Just the GUI always <incorrectly> states 'Blocklist has 0 rules.' ...
root@NetHD1:/# man transmission-daemon
No manual entry for transmission-daemon
So that must be Fiction!
GUI reports (as the screenshot shows at the top of this post) "Blocklist has 0 rules."
So the GUI is also MAYBE fiction - until someone can tell me how to check that the blocklist that has been created in the /opt/apps/lenovoemc/Transmission/blocklists/filename.bin file is actually working!