If you need to run clonezilla on older hardware, the latest version might not run because clonezilla is compiled for i686 and above.
Even some Pentium compatible chips like the VIA C3 would not run all i686 code as it lacks the cmov instruction.
These are the latest versions of clonezilla for i486 and i586:
clonezilla-live-2.2.3-25-i486.iso