If you ever run into this “Plugin does not have a valid header” error when installing a wordpress plugin, here is a very simple solution that tends to work most of the time.
Find the plugin in question.
Lets imagine you just bought EZ Empire Builder and are ready to install it on your Wordpress site. Lets also assume you just updated to Wordpress version 2.9.1 from 2.8.
The first thing to do is to go to your wp-admin panel and click,
‘Plugins > Editor’
Next, see the drop down menu near the top right side of your ‘Edit Plugins’ console. Open the drop down menu and find ‘EZ Empire Builder’ and select it by hitting the ‘Select’ button.
On the right side of the text box you will see several files that make up the EZ Empire Builder plugin. One of those files will be,
Click that link and you will see the contents of that readme.txt file appear on the main text editor.
Inside this file you will see where it says,
‘Tested up to: 2.8.4′ or something similar. This number may vary but the important thing is that it shows at least as high as the current version of Wordpress that you are currently using.
To fix your “Plugin does not have a valid header” problem, simply edit this number to your current version number or higher and save your changes.
Now your headers problem should be resolved until such a date that your update your Wordpress Version to a date beyond your current new setting. Updating to Wordpress 3.0 for example would require this setting to be updated again.
One easy way to avoid this problem in the future is to set it quite a bit ahead. The “Plugin does not have a valid header” error serves no real value and can be easily suppressed so, might as well do it and save yourself the troubles.
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