You can also go to Seed-Fansubs channel and get the episodes from the bots. The only episodes I think they dont have are 47 and 49 or something so you can go to the GundamSeed channel and get the episodes you need from their bots to. However, #GundamSeed has only 1 bot that has all the episodes so if you plan on using Irc, your gonna have to find the episode the bot has and queue in the long line until its your turn.

Server (for both Seed-Fansubs and GundamSeed): Rizon
Channel: #Seed-Fansubs & #GundamSeed