Hi,
The error message you have is related to Joomla and your server configuration ; it is not related to HikaSerial or his package.
You should check the folder permissions in your website in order to be sure that you will be able to install a component/plugin.
You also check the "upload size limitation" of your server (and of PHP).
Knowing that the sub message is "unable to find install package" ; it means that the ZIP (or tar.gz) you have uploaded are not in the server afterwards ; and because that ZIP (or tar.gz) is not in the server, the installation cannot proceed.
So the problem is with the upload of the zip to your server.
We have a documentation page in our website which talk about generic problem with installation.
You will find there a method to "install by FTP" to avoid the problem of uploading packages.
www.hikashop.com/support/documentation/5...-install.html#errors
You can find messages with the same error message on the Joomla forum.
Like this one :
forum.joomla.org/viewtopic.php?t=767994
And here a search on all posts on the joomla forum for that error message :
www.google.com/search?q=there+was+an+err...ite:forum.joomla.org
I hope it will help you.
Regards,
Jerome
