OK, I managed to get the link to work and I can see you have missing icons and the buttons are not operating as they should.
Was the software downloaded to each PC over the internet. If so uninstall it and download the software again with your firewall switched off.
I don't understand what you mean here
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What do you need to upload the firmware?
A firmware upgrade can be done from the PC by logging into the router, the address will be 192.168.xxx.xxx. Type ipconfig into a command prompt and use the address given by the Default Gateway. You just need to put in front of the number.