ReadySHARE Printer Utility, download, etc.

Not sure that I can understand where things are going wrong at your end.

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_JR wrote:

NETGEAR   Nighthawk X4S AC2600 Smart WiFi Router Model RC8700

 

I can find no reference to a RC8700 in the Netgear system. Perhaps you mean R7800.

Is that what you have?

Visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware.

That page will also have any software and firmware for your device.

The ReadySHARE Printer Utility Version 1.36 (Windows) is there.

Nighthawk X4S R7800 | AC2600 Smart WiFi Router | NETGEAR Support

That should be enough to get you going.