I get the following when I try to install new software on my CMS "500 Internal Server Error"

This can relate to a number of problems however it often associated with folder permissions or 'timeouts' associated with server configurations. 

Read more: I get the following when I try to install new software on my CMS "500 Internal Server Error"

I can't install new components / modules / plugins on Joomla - what is wrong?

There are a number of possible issues - these are the two most common:

Incorrect PHP Handler

One very common issue is the website host changes a setting called the php handler (or 'web server to php interface' setting).  If you could install software before and you can't all of a sudden, the following steps can help you troubleshoot if this is the issue.

Read more: I can't install new components / modules / plugins on Joomla - what is wrong?