For upgraded (Testcase) Kernels, goto
 http://www.os2site.com/sw/upgrades/kernel/

 Be aware that Testcase kernels, and other fixes are just that !

 At present, eCS v1.0 is at the same level as  OS/2 Warp 4 Fixpack 15 and the CP1

 At present, eCS v1.1 is at the same level as  OS/2 Warp 4 CP2