Hi,
Wehn you change the domain of your website, you have to update the information of your license but you have to update the "joomla updater" url too.
Because your license key would change. By reinstallating HikaShop, it would update your license key.
Otherwise, you can send me a pm with your new website url and I would send you the corresponding update url.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.