The launcher will ask for a username/password. Type anything (e.g., OfflinePlayer / 123). The emulator accepts all logins.
Offline saves are stored locally in Documents\Command & Conquer 4\SaveGames. The game can create hundreds of autosaves, leading to bloat and slower load times. The launcher will ask for a username/password
This is the best way to play. The community built a server emulator that tricks the game into thinking EA’s servers are alive. It removes the lag, the login queues, and lets you play the full campaign plus skirmish vs. AI. This is the best way to play
With the fixed launcher, the game will skip the "EA Online" login window. However, the game still needs a profile to save your progress in the campaign. the login queues