Excuse me, what you want to ask is "the reason why the error code appears in Creative Cloud Installation Error Code 204mac"? This error code is caused by an AppleID password error, a network connection problem, or a corrupted system file.

1. If you enter the wrong password multiple times, resulting in the error code 204mac, you can try to reset the AppleID password. Go to Settings, iTunes and AppStore, your name and password, click Forgotten Password, and then follow the prompts to reset your password.

2. Make sure the Mac is connected to a stable Wi-Fi network. If there is a problem with the network connection, please restart the router or contact the network service provider to solve the problem.

3. Open the terminal and enter "sfc/scannow" to scan and repair the system files.

None of the above methods can solve the problem. Try reinstalling Creative Cloud.