Adobe Error Code 501 -

If the 501 error is caused by network instability or the Creative Cloud Desktop App refusing to cooperate, bypass the App entirely.

Adobe’s installers are massive. If the connection hiccups for a fraction of a second during the handshake phase, the installer may try to "resume" a file that is now considered corrupt. The checksum fails, and the error code appears. adobe error code 501

Aggressive antivirus software (McAfee, Norton, Avast, or even Windows Defender’s real-time scanning) can quarantine or alter Adobe installer components mid-download, corrupting the signature. If the 501 error is caused by network