Hi, I would greatly appreciate if someone could give me a download link for cryengine 3.5.4
and thank you

The FreeSDK download links was removed a long time ago as its no longer supported. Hopefully you are not choosing engine based on where a video file can be played back? :p I would recommend using CE5 and get a community effort into place getting video playback support in CRYENGINE. Working with the old FreeSDK nowadays really doesn't make much sense.

Vote for video plugin on here .
https://trello.com/b/RbxUan3T/cryengine-wishlist