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I think it should work on it, it doesn't use PHP 5.3+ specific features.

Actually looks like you're using some magic constants (e.g., __DIR__) and namespacing.

One instance of namespacing I've found so far is line 118 in the Common/InputDataProvider.php

Yes, I have just noticed. It will be really great if you will make pull request of version which is compliant to you old version!

You got it!