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I am testing with XOOPS 2.5.6 with the latest from the GIT and am getting a blank page when I click the "install Module" button. I have not tested with 2.5.7 or 2.6, what the exact url for these anyway.
I remember trying to test 2.6 and abandoned after seeing so much requirements of the webserver. Which web server meets the 2.6 requirements right off-the-shelf for 2.6. I am using xamp.