Addon not installing

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Hi, I was wondering if anyone could shed some light on an issue I am having trying to install the SagePay Payments addon by Jared. I have tried to contact Jared but haven't had a response. I am running C5 version 5.5.2 and once I have downloaded it then try to install I get the following error:

Catchable fatal error: Object of class CoreCommerceSagepayPackage could not be converted to string in /home/sites/joytocreate.com/public_html/c5/concrete/libraries/3rdparty/adodb/adodb.inc.php on line 978

Has anyone else encountered this issue and how would I go about fixing it?

Many Thanks