You want to restore backup of Content Analysis appliance OS by uploading the configuration file in the GUI, Utilities > Configuration : Upload Entire Configuration; However, you get the below error:
Failure - Version of uploaded file does not match currently running version
You cannot upload configuration of one CAS OS version to another.
Confirm the OS version of the CAS of the configuration XML file. Search for 'version' or browse to the last line in the configuration file. You will see a line that contains the OS version as below:
</bannerText><showConsentBanner>true</showConsentBanner><showLogo>true</showLogo></consentBanner><logo></logo><version>3.1.5.2</version><maSettings>
The version you see here is 3.1.5.2. Upgrade / Downgrade the target CAS OS to this version & then upload the configuration file for restoration.