Hey I'm not sure whether this is the correct place to ask for help or not but I just thought it may be because others who encounter the same problem might find this helpful.
I used to have Norton but got annoyed of it because I couldn't use this blocker.
After uninstalling it yesterday and installing MalwareBytes everything seemed to be working while testing (tested it by clicking only the servers I wanted and checking if i could ping the others, the deselected servers could not be pinged which means it worked).
After trying to use it today, no matter whether i select the servers or not I am getting a ping from every server.
Bug Report/ What I have tried
I followed your guide, checked that windows firewall is on and working (which it is), and the whole page looks exactly like yours.
After blocking a server by not selecting it I checked the firewall page to check whether they are actually being blocked (which they are, which means the program is blocking the servers).
I have matched the servers which are being blocked by the ones of CS:GO, they seem to be correct.
Pressing reset removes the blocks.
I have tried downloading the newest version even though i already have it (3.4).
Running Windows 10