I'm not sure about the first part of the question about the evaluation license, but I have seen the package load failure. From what I recollect, there are two scenarios where you might see the load failure:
1). A beta version of [blacpearl] was previously installed on the same machine.
2). The developer components were installed on a drive other than C:
The first thing I would do would be to make sure any beta bits were completely removed, then try upgrading to SP1. Make sure you read the installation instructions for SP1 to fully understand any requirements.
David
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