Hardware update file is not compatible with my Apple OS

[lnewman1107]

Trying to manually download firmware update, as I get this message "Unable to connect to NetGear server"

My laptop does not recognize this file type:  R6900-V1.0.2.26_10.0.45.chk

When sent to the Apple Store, it does not recognize this file type, assuming it is the ".chk" file.

So, neither automatic or manual firmware update work.

[FURRYe38]

That's because your not supposed to be opening that file at all. You need to use this file on the routers FW update web page using a web browser to send this file to the router itself: 

https://kb.netgear.com/23960/How-do-I-manually-update-the-firmware-on-my-NETGEAR-router