Well, you can do the pairing process also using a Windows 10 system. Afaics, you’ve already done the right steps. Retry the pairing process inserting the dongle into the USB port of the Windows 10 system instead of the Vero, there is also a general wiki thread. If the pairing is successful, the remote LED will finally flash three times.
If you did not purchase the remote control with the Vero within the last 12 months but before and you want to keep using this kind of remote, you can buy a new one in the shop, see the link on top of this web page.
If you have bought it within the last 12 months you should open a support ticket, see “My Account” on top and follow the support request procedure.