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I was tried to update my MacOS from Mojave to Catalina. But it was not worked for me and still opening Mojave.After the update I have tried my wifi is connecting but unable to browse. Google services like youtube drive are opening. Other websites or apple update nothing is working. Unified agent is showing WSS - failure connection. In my bluecoat status area it is showing Not connected to web security services - failur mode closed

I can't update my laptop without connecting to a nw. Please help me on this.

You have to do the following below.

For El Capitan and newer, the procedure is as follows:

Disable SIP (System Integrity Protection):
Boot into recovery mode (cmd+R)
Select Utilities -> Terminal from the Menu Bar.
In Terminal, input the following command: csrutil disable
Reboot
Boot into Safe Mode:
Shut down the computer.
Hold the shift key down and turn the computer on. Keep shift held until you see the login/bootloader screen.
Input the password for a local account with administrative privileges and press Enter
Eventually you'll be prompted for a username and password. Input the username and password of the local account to login.
Remove the expired certificate:
Navigate to Applications -> Utilities in finder.
Open Keychain Access
In the menubar, click View -> Show Expired Certificates.
In the search box, type Entrust.
Select the expired certificate, then right-click it and select Delete.
Reboot the computer and boot back into Recovery mode.
Enable SIP.
Boot into recovery mode (cmd+R)
Select Utilities -> Terminal from the Menu Bar.
In Terminal, input the following command: csrutil enable
Reboot
After this most recent reboot, the BlueCoat agent will work again.

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