Operating System
Hi I would like the software to be on two other computer (both Mac’s) as well as the one I am on. When I try to down load onto another computer I get a “Your already Logged in” when I am not>
Papyrus Author Version
You can install Papyrus Author on an additional computer, and use your existing user account on it.
There are a few things to consider when working on multiple computers, here’s another thread on it: Working on Multiple Computers
Could you take a screenshot of the error message? This way I’ll know exactly what the message is, and I can help you better! 
How to take a screenshot
Use the snipping tool or screenshot tool to take a photo of the problem by following these instructions:
For Windows: Use Snipping Tool to capture screenshots
For macOS: Take a screenshot on your Mac
You can attach images to your post by simply dragging and dropping them into the reply field.