This copy of the Install macOS application is damaged

Issue

Trying to install a fresh copy of macOS High Sierra on a MacBook Air using a bootable USB key. The installation fails to proceed with the following error:

This copy of the Install macOS High Sierra application is damaged

This copy of the Install macOS High Sierra application is damaged, and can't be used to install macOS.

Microsoft Exchange account stops working in Apple Mail - Enter Password

Issue

Microsoft Office 365 Exchange account stops working in Apple Mail on macOS. Apple Mail and Internet Accounts in System Preferences prompt to re-enter Microsoft Exchange account password, but after the correct password is entered, just shows spinning wheel icon indefinitely.

Enter the password for account

TeamViewer on Mac - You are currently offline. Please check your internet connection

Issue

Mac OS version of TeamViewer 15 displays the following message in Computers & Contacts tab:

Teamviewer  - You are currently offline

You are currently offline
Please check your internet connection.
The application is trying to reconnect

The computer is actually online and TeamViewer can connect to clients by manually entering ID and Password. It's just Computers & Contacts section that doesn't work.

Time Machine couldn't complete the backup - an error occurred while copying files...

Issue

Time Machine on MacBook Air fails every time with the following error:

Time Machine backup failed

Time Machine couldn't complete the backup to "MacBook Air Time Capsule".
An error occurred while copying files. The problemmay be temporary. If the problem persists, use DiskUtility to repair your backup disk.

Other MacBooks backup to the same Time Capsule disk with no issues.

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