On https://www.cryengine.com/ I see both a community link and a support link.
You'll find both are much better places for your question than this forum.
Back in January this year Windows installed a couple of updates. The result was a disaster: my most important program would not run. Fortunately I was able to fix it by uninstalling the update. But several friends have exactly the same problem, and for one the uninstall failed.
The program that failed in the Cry Engine 3 free SDK (Editor.exe).
When I tried to run it after the update, Windows showed busy for a second or so and then - nothing. Editor.exe did not start and there was no error message.
There is also a 32 but version of Editor.exe. This does run, but is unusable due to very bad performance.
To summarise: after the update in January the 64 bit version of Editor,exe did not run, but the 32 bit version did.
I'm hoping the fact that it only affected the 64 bit version is a huge clue.
Does anyone know of a fix for this?