Trouble connecting to server

In the last couple of days I’ve been trying to connect to PrevalentGaming’s DarkRP server. Whenever my client starts its routine download of rp_downtown_fiend_day_v2, the game automatically gives me an error saying “Disconnect: Flex HD timed out.”. Now, I can see other people are playing on the server, because it says so in the player list under the server IP. This is one of my favorite servers, so I’d appreciate any help.