Installation Issues

Installing an Addon should be a straight forward and easy task. But despite our attempt to make things easy, sometimes things go wrong. This Guide is a collection of Issues which have been reported by others. Ok, we have only one issue by now, but we add them as they get reported.
Don’t Panic. Your problem can be fixed.

DLL load failed: %1 is not a valid Win32 application

This happens on Windows when your Blender Application Data folder is corrupted. We never found a good reason for when this happens, but it does happen.

Note: This issue is also documented in the Blender manual

Fix

Clean up your Application Data. You find the data here:

C:\Users\<username>\AppData\Roaming\Blender Foundation\Blender\<release>

Details

Sometimes another Addon installation pollutes the Application data folder with scripts and libraries from older blender versions. This can easily make it impossible to install another Addon. We ensure that our Addons never creates such sort of pollution. And here is how you can get out of this issue:

  1. Locate the Blender Application data folder (see above)
  2. within the folder locate the subfolder that is named like your Blender release, for example: 
     Blender Foundation\blender\2.77
  3. rename this folder to something like 
     Blender Foundation\blender\2.77_hide

    Note: The name is not important, use whatever is convenient for you. You even can delete the folder if you like, but see below!

  4. Now restart Blender

This will cleanup your application data folder. But take care! This resets blender to its Factory settings. Any other Addon that you have installed is no longer visible and you need to install them again. However you can use the hidden subfolder ( 2.77_hide in my example) to recreate your installation. Although in most cases it seems easier to install all of your Addons again.