Hello,
it gives an error on loading the page.
It would be interesting to know more about the error you have.
You can install a new version of HikaShop in your website, it will perform the update and if you install a starter over a business, the business features will be removed.
Otherwise, as usual, the update won't delete your products/orders/configuration/overrides. But if you have modified some core files, your modifications will be lost.
In any case, it's still important to perform a backup.
Regards,