I guess I wasn't clear.
I have the latest '09 iWork apps on a backup and on a clone of my old 10.8.5 disk.
After making the backup and clone of my old disk I reinitialized and ran low level tests because I had disk corruption.
I mapped out the bad sectors and re-partitioned and formatted the drive using my usb stick with Drive Genius.
I opened the laptop to clean out all the dust, clean the fans and connectors, ...
I then used my 10.8.5 restore usb stick to to install a clean new 10.8.5 on two partitions on the internal disk --
one small for emergencies and being able to run utilities if there are problems,
and one large partition for installiong a new os.
I downloaded the 10.11.6 install file, made a backup copy of it and tucked it away, then upgraded the main partition from 10.8.5 to El Capitan 10.11.6.
So now I "could" copy my old iWork apps to the new partition.
When I mount the backup - the iWork application icons show without the 'X' indicating they 'should' run under 10.11.6.
But I do not want to do that in case there is corruption in my copies from my disk errors.
I will do file copies (not bit copies) of my data but want to install new clean versions of all the applications.
After all this work I want everything to be as pristine as possible.
This puts me in the same predicament as anyone who upgrades to El Capitan and does not have a copy of the iWork applications. --- How can you install iWork on El Capitan?
I have downloaded the iWork 9.3 update file and saved it away.
I have purchased a sealed in-box retail iWork '09 ver.9.0.3 DVD and will continue when it arrives next week.
I tied my old iWork '08 CD but it would not install and just ejected when I put it in.
It will still leave me two versions down with the '09 versions.
There are 2 newer versions that will run under El Capitan --
iWork 2013 with Pages 5.9 and Numbers 3.0 has OS X 10.9 minimum requirement, and
iWork 2014 with Pages 5.5.1 and Numbers 3..5 has OS X 10.10 minimum requirement, BUT
those were distributed in the App Store so they are unobtainable.
But, from everything I have read the '09 versions are better, more full functional, than the newer ones that were made compatible with the iOS versions. So I guess I will be happy at '09.
Meanwhile I have mounted my backup 10.8.5 disk and am running as if it was the old 10.8.5 machine.