Hi,
Yes the demo website works good.
You can use the "demo / demo" login on the front end. Otherwise, you have to create a user, register as a vendor and publish the vendor.
The fornt-end menu contains a "HikaMarket" link into the "Other Features" menu. With this link, you can access to the Vendor control panel when the user is logged with a vendor account.
The demo website is every 3 hours so, it is possible that the website is reset during your test.
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.