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For Xoops 2.5.6
System requirements
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PHP:
Any PHP version >= 5.3.7 (PHP 5.4+ is strongly recommended)
MySQL:
MySQL server 5.0+
Source:
https://xoops.org/modules/news/article.php?storyid=6476Try uploading the checksum.md5 and checksum.php files from the Xoops 2.5.6 package to verify your files are correct.
Quote:
Files integrity check
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The full XOOPS package is released with a script able to check if all the system files have been correctly uploaded to the server. To use it, follow these instructions:
1. Upload the checksum.php and checksum.md5 files located in the XOOPS package root to your XOOPS server folder (putting them next to mainfile.php).
2. Execute checksum.php with your browser
3. If necessary, re-upload the missing or corrupted system files
4. Remove checksum.php and checksum.md5 from your server