If the update also contains the .bin file you can do upgrade initiated from your SPA-2102 device directly :
Upload the spa2102-x-x-xx.bin file to your TFTP server root directory.
Start the TFTPD service Update the SPA's config in the Provisioning screen / section Firmware Upgrade :
Upgrade Enable : YES
Upgrade Rule : tftp://IP_address_of_tftp_server/spa2102-x-x-xx.bin
After saving this your SPA-2102 will attempt FW upgrade within 1 hour.