8
first download the xoops 2.5.1a package (the full package)
extract the files:
checksum.md5
checksum.php
upload those two files to the same directory as your index.php of your xoops installation. then goto the checksum.php with your browser.
edit:
page 7 on the xoops 2.5 installation guide talks about this a little too
https://xoops.org/modules/mediawiki/index.php/Installation_Guide
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