Unable to Install from Software Center

My problem is that I am unable to install programs from Zorin's software center. This only has been happening for a few weeks, but I'm not exactly sure what caused it. It might have been when I was trying to explore the system settings. Whenever I am in the software center and I click the "install" button,a window pops up (after the box for entering the password, which has no issues) with an error image on it (dark circle with white bar in the middle) that says "This requires installing packages from un-authenticated sources." Under details, what it lists varies on the program I am trying to install. For Skrywer 2, it's "libqt5multimedia5."

I am running Zorin OS 8 and I have a 32 bit system.

Hi there, Zorin 8 was a stepping-stone release and is no longer supported - just like Ubuntu 13.04 on which it was based - you need to update to Zorin 9 friend!

Hi,

update to version 9 using the following and you won't lose your files!:

viewtopic.php?f=6&t=4848

http://zorin-os.com/free.html