How to get a refund of Extended Download Service only?

You can write an Email to the payment platform, Swreg/Regnow, since the Extended Download Service is charged by them instead of by us.

REGNOW: accounts@regnow.com
SWREG: swreg-clientsupport@digitalriver.com

You had better specify your order ID, and that you just want Extended Download Service to be refunded, but keep the software in the e-mail.

Extended Download Service enables you to download your purchased software version again in case of computer crash, virus, etc. For more detailed information, please view here. https://usd.swreg.org/eds.html