Will Adobe CS5 with Java SE 6 runtime work on 10.11 El Capitan? I am running OS X 10.10 Yosemite which happily runs my Adobe CS 5.0.  When I upgraded from 10.8 to 10.10, I had to install Java SE 6 runtime. 

In parallel, I also run the latest Java, with browsers set to ask before running it. All seems to work ok.  

If I upgrade to OS X 10.11 El Capitan, is Adobe CS 5 likely to continue working?

(I totally depend on my legit copy of CS 5, and I don't have the revenue stream to support ongoing Creative Cloud membership.)
Yes, you will need to install the Java version from https://support.apple.com/kb/DL1572?locale=en_US

From that link:

"Java for OS X 2015-001 installs the legacy Java 6 runtime for OS X 10.11 El Capitan, OS X 10.10 Yosemite, OS X 10.9 Mavericks, OS X 10.8 Mountain Lion, and OS X 10.7 Lion.

This package is exclusively intended for support of legacy software and installs the same deprecated version of Java 6 included in the 2014-001 and 2013-005 releases.

Quit any Java applications before installing this update."

After installing and restarting you can use the Java preferences pane in System Preferences to control which Java version you would like to use.