A small number of our staff are running into problems caused by not having permission to update or install things on their computer. The reason is that they are not properly listed as an Administrator on their user account

You are supposed to be an admin on your computer, and there is an item in Manager that is made to help you with this problem 
This option makes you an Administrator, and is called "Upgrade user to admin". 

Find it, use it, and wait 5 minutes to make sure it has time to activate. 

Then restart your computer and you should have an Admin account and be able to make changes to your system normally! 

Here is an example of what that page looks like in manager: