Register Plus errors when copying website

I recently copied my website to xampp for testing purposes. My live website is using the latest WordPress with various plugins and everything works fine.

However with the desktop copy I have encountered errors with the Register Plus plugin. Everything else on the desktop works fine except this plugin which throws up the following error messages:

I can successfully login, but on the Login Screen this error appears:
Warning: getimagesize(A) [function.getimagesize]: failed to open stream: No such file or directory in mywebsite/plugins/register-plus/register-plus.php on line 1166

On the Settings Page I am unable to save any changes and I get the following error:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in mywebsite/plugins/register-plus/register-plus.php on line 579
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On the Dashboard – Invitation Tracking Code:
Warning: Invalid argument supplied for foreach() in mywebsite/plugins/register-plus/dash_widget.php on line 36

There may be other error messages, but these are the only ones I can see.

Considering everything works ok live, can anyone suggest what might be causing these problems with the copy?

Thanks.