There was a small error in the how to manual about the upload dir for the .dat files of maxmind. Note that it is /plugins/system/GeoBlocker/GeoBlocker/lib
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Thank you for your review! We would like to bring to your attention that as of version 1.2, you can explicitly allow or block IP addresses or ranges of IP addresses.
Also, we fixed the bug in regards to the location of the MaxMind .dat file upload. As of version 1.4, it should indeed be placed in: /plugins/system/GeoBlocker/lib (as the manual also specifies).