Can't find where to install earlier versions of software

Start budgeting for a new computer.   Adobe wants customers to use the latest operating systems -- no more than two versions back.

Most Creative Cloud apps work on:

• Windows 11, Windows 10 versions 21H2, 21H1, 20H2, 2004, and 1909 (LTSB branches are not supported;)
• macOS 12 (Monterey), macOS 11 (Big Sur), macOS 10.16 or 10.15 (Catalina).

https://helpx.adobe.com/creative-cloud/system-requirements.html

High Sierra is a full 4 versions behind.

Hi Mark,

The last version to support macOS 10.13 'High Sierra' was CC 2020... You should still be able to get those installers:

How to Get the Creative Cloud 2020 Direct Download Links

If not – or if you're in a hurry – then CC 2019 will also still run:

Here Are the Creative Cloud 2019 Direct Download Links

Outside of that, there's no other way to get those older, original installers because they are no longer supported by Adobe.

Adobe now offers the current and ONE older version via the online program manager
.
I do not know how far back this process will go, but try this link
-NOTE that you will have to search the site for your specific download
Direct Download Links https://prodesigntools.com/tag/ddl MAY help
-you MUST do what it says in Note: Very Important Instructions
-https://prodesigntools.com/adobe-cc-2015-direct-download-links.html#download-instructions
-the prodesign links go directly to Adobe's file server, so this process will
--only work until Adobe completely removes the old version(s) from the server
.
IF/When you do have a download, be sure to copy it to AT LEAST one external device
-since Adobe does sometimes remove old versions from the server
-a usb flash drive or external hard drive, or write to a DVD