Hi,
By updating HikaShop you won't loose any information. It will just upgrade the files and add new columns in the database if required.
Your views overrides, css [/b]overrides[/b], language, configuration, orders, products will stay intact.
But careful if you have modified directly an HikaShop file and you didn't use the backend interface for that. Because you could loose your modifications.
Making a backup is always a good security.
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.