How to download newer sentinel(DX4000)'s ISO?

I’m lost download newer sentinel ISO image and newer softwaer set(zip)
How to download the product OS and update image ?

What do you mean update image?
There is no update from Server 2008R2
If it is broken you can contact WD and get the ISO to put it back like it was.

Because the latest version i want.

Current ISO : APAC_SvrRecovery_1_7_5_17.iso
Current Software :

if you search in the forum you will find the direct link in older posts (even for the latest version)