Hi Karen,
Adagio Receivables 9.2A (2015.06.25) is a valid service pack release. Release date (2015.07.01) was a hot fix release. Since then, there have been 2 more hot fixes for AR, followed by the service pack (2016.02.26) that you quoted in this post title.
I suspect the different password for the July 1 hot fix, as compared to the June 25 service pack, is not the cause of any installation problem you are running into here.
We are not aware of any problems with the installation of this service pack not being able to recognize any of the previous hot fix versions and thus refusing to install correctly. You will probably need to be in contact with your Adagio consultant for assistance, if you haven't already.
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Regards,
Softrak Tech Support