If you have installed an older version of a certain set of actions, I recommend you remove it prior to installing the new one.
Here's how to do it:
If the actions are loaded in the actions panel, please select the actions set (1). Then click on the panel's trash icon to unload it (2):
Note that this won't delete the actions files from your hard disk. It will merely unload the actions from Photoshop. To delete the files, please proceed to step 2.
Navigate to the folder where you keep the PanosFX actions files. If you don't remember where you stored the files, perform a file search:
Select the old (or trial) file versions and delete them.
Download the latest version from PanosFX. Save the zip file into the folder where you keep the PanosFX files and decompress it. Finally, load the actions in Photoshop or in Photoshop Elements, using the menu button on the upper-right corner of the Actions Panel.
Note: if you prefer to store the actions in Photoshop's "Presets/Actions" folder, restart Photoshop. The PanosFX actions will show up in the flyout window, when you click the menu button of the Actions Panel. Click on a set's name to load it in the Actions Panel.