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1. PHP REQUIREMENT LINK : https://www.boonex.com/trac/dolphin/wiki/DolTech#ServerRequirements 2. Upgrade method https://www.boonex.com/trac/dolphin/wiki/7.3.5-7.4.0 3. downlaod patch for upgrade and make ground zip upgrade.zip 4. Upgrade is possible only from the last version. Update in info.xml and upgrade.php for the same.