Error installing module - Class PaymentModuleOverride553a67abee404 does not exist

[jesperhs]

I have bought this module: 
http://addons.prestashop.com/en/checkout-modules/16890-hamon-attach-terms-of-sale-and-other-files-to-emails.html

 

But when I try to install it, it gives me an error: Class PaymentModuleOverride553a67abee404 does not exist

 

What can I do? 

Really hope someone can help me!

 

Regards,

Jesper

[TorbenЯune]

Hvis du er sikker på, at du kører PS version 1.6.0.9 eller derunder (ned til 1.5.0.0), så må du kontakte udviklerne (Codeworks). Der er supportlink til dem på den side du linker til.