how to download PS onto a second device?

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 desktop http://helpx.adobe.com/creative-cloud/help/creative-cloud-desktop.html

-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/2241704 may help

-and http://prodesigntools.com/adobe-cc-2017-direct-download-links.html

-to download Lightroom https://helpx.adobe.com/lightroom/kb/lightroom-downloads.html

Also go to https://forums.adobe.com/community/creative_cloud/creative_cloud_faq