Missing Check for Updates button on the Router Settings page

[jseagull]

The upgrade firmware directions note that the user should select the Check for Updates button to check for new firmware.  My WNDR3400 v3 router does not show that button.

I am looking under http://www.routerlogin.com/ > sign in> Advanced > Administration > Router Update

I manually updated my firmware to 
Firmware Version
V1.0.1.38_1.0.68

However, there is still no Check button for updates.

I am using Win10 with Chrome, both with up to date software

thank you