Hi,
There is no problem to install HikaShop Business over HikaShop essential ; it will perform an upgrade.
Now please read the instructions in my previous message in order to have details about the error you have.
Without knowing what is the error ; you can't solve it.
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.