this is an old thread and the info was correct in 2017.
currently, the adobe cc desktop app only includes the most recent and one major version prior.
however, all the previous versions are still available. with os 10.13, that last compatible versions are cc 2020. for those links you have to contact adobe support*
. if you can live with cc 2019, those links are available via prodesigntools, https://prodesigntools.com/adobe-direct-download-links.html
follow the directions (esp, step 1)
save the install file. it may not remain online.
thank jim @ prodesigntools.com
*
use a browser that allows popups and cookies and contact adobe support by clicking here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human
p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative. ie, double check for an employee badge if contacted in the forums and look for an adobe.com domain in the email address if you click reply to an email. then check again and be very suspicious. any other method of contacting (or offering to contact you) is almost certainly a scam, https://community.adobe.com/t5/using-the-community-discussions/staying-safe-in-the-adobe-support-community/td-p/12919684/redirect_from_archived_page/true.
p.p.s you can also use phone (but chat is usually quicker), https://helpx.adobe.com/contact/phone.html
p.p.p.s. you can also use twitter to tweet @AdobeCare.