Hi,
See :
www.hikashop.com/support/documentation/5...-install.html#errors
Install via FTP
If you have difficulties to install HikaShop, you may want to try to install it via FTP.
This way, Joomla won't have to upload the HikaShop package on your website so the installation will be much faster.
* Extract your HikaShop package in a folder called "hikashop" on your own computer.
* Open your FTP software (FileZilla for example), connect to your website and upload the folder "hikashop" in the temporary folder of your website : /tmp/
* Go to your Joomla Installer manager on your website backend and specify the path of your folder in the input "Install from Directory" : "\home\...\tmp\hikashop".
* Click on the button "Install"... the install process should be much faster and will enable you to successfully install HikaShop.
Even if the text is talking about HikaShop ; it is the exact same thing for HikaSerial.
You wrote
copying the package zip file in \tmp
So I'm afraid that you did not follow the instructions because you should not upload the zip, but the uncompressed content which is in the zip file.
If you really can't install HikaSerial in your website, we would need an administrator access to your backend and also FTP access to your website.
You would be able to send us such private information thanks to our "contact us" form.
Regards,