So far everything was working fine, then yesterday I tried to install a new Joomla Design template to the system and it told me - Installation Error - Counld not find the Installation Package File.

Ok, so I checked the template and everythign looks fine. I have installed it to another Joomla Site, without Multisites and no prblem it installed fine.

Then I tried to install a usual plugin to the Multisite Joomla Site and same problem: Installation Error - Counld not find the Installation Package File.

Now I checked the rights of the folders and files for /tmp - /templates etc. everything looks good and I even made a chmode to 0777 but the problem still occours.

Anybody else has the same problem? Maybe somebody can verify it?

Zappu

Can you give us a screenshot of the error message.
We do not find the "Installation Error - Counld not find the Installation Package File." message in joomla.

Perhaps this is a message created by this template package.
Perhaps you could send us this template in an attachement of an email to allow us try it.

We also search the word "Counld" that is not found in joomla and JMS.

This is the message: UNABLE TO FIND INSTALL PACKAGE=Unable to find install package

And it doesn't matter what I try to install, modules, plugins, templates, components it always appears

Mmmh, I have uninstalled the file fixes once and tried the installer than, but te problem still exist. I think it's maybe not a Multisite problem. If somebody could verfiy that he/she can install something to the system after the patch, I culd be sure it's not a Multisite problem.
Could somebody be so kind please?

Zappu

We told you to send us this extension in attachement of an email to review it.
As we don't have received this extension, we can not give you more information.

Which extention should I sent to you, please name one. As I have written, the error occours in generell. It doesn't matter what you try to install, it happen whenever you install something.