Hi,
You can just install the same HikaShop version that was previous installed (using the install package you got)
After that, you will be able to copy the database content from the backup.
But if you have some css override, some view overrides and upload files.
You should check the files and restore some.
Images : media/com_hikashop/upload/
CSS : media/com_hikashop/css/
Views : templates/your_frontend_template/html/com_hikashop/
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.