When you try to play Gundam Evolution Right now you are seeing an error code 503 and that maintenance is in progress. Unfortunately there is no solution for this as the game is not really online yet. Instead, it’s only available for preload ahead of the official launch date.
Why am I getting error code 503 in Gundam Evolution?
You are getting an error code 503 in Gundam Evolution because the servers are not online yet. Installing the game will only preload it, but it will not be playable until September 21 at 7pm PDT/10pm EDT. So the solution is to wait until that moment and start the game. Then it should work as expected.
The whole thing is so confusing because it’s a free-to-play game. For some reason there doesn’t seem to be a way for the developer to allow players to preload a F2P game and still keep the unlock timer on the store page. So when you download Gundam Evolution it looks like it’s a published game.
Error code 503 will likely be used for maintenance periods in the future. So if you try to play the game after the above date, assume the servers are down for an update and try again a few hours later.
https://www.gamerevolution.com/guides/715053-gundam-evolution-error-code-503-maintenance-in-progress-fix Is there a Gundam Evolution Error Code 503 Maintenance in Progress Fix?