Background
Occasionally, the fastProjectAI functionality (tabs in the ribbon) will disappear. This is usually due to the Global file getting corrupted. If this happens, then the fastProjectAI Global file needs to be re-installed. This is done very easily, and does not involve IT.
Instructions to Re-install the fastProjectAI Global
Exit fastProjectAI/Microsoft Project
Open two File Explorer windows
In the first window (we will call this Window #1), go to the folder c:\Program Files\fastProjectAI\System and you will see a file called Global.mpt
In the second window (we will call this Window #2), go to the folder c:\Users\<your username>\AppData\Roaming\Microsoft\MS Project\16\en-US
If the AppData folder is not visible, go to the File Explorer tab > View > Show > Hidden Items
Copy the Global.mpt file in the first window (Window #1) to the MS Project system location in the second window (Window #2).
Please ensure you do not copy from Window #2 to Window #1 as this will overwrite the fastProjectAI Global.