How would I install the 2nd user of InDesign onto another computer? I think I need to register its serial number onto my account first, but not sure.
It is not a 2nd user, the license allows the OWNER to install and activate twice
Download & Install instructions https://forums.adobe.com/thread/2003339 may help
-includes a way to go to a page to download Adobe programs if you don't have a disc or drive
-you will need to enter your original serial number during install for non-Cloud programs
-Cloud Getting Started https://helpx.adobe.com/creative-cloud.html
-Membership questions and problems https://forums.adobe.com/thread/1146459
-or kglad links in reply #1 here https://forums.adobe.com/thread/2081216 may help