OrangeHRM version 2.4.1 contained automated upgraders for version 126.96.36.199, 2.3 and 2.4. But it didn't support version 188.8.131.52. OrangeHRM 184.108.40.206 is almost similar to version 2.4 except for few minor file changes. Therefore you might have noticed that 220.127.116.11 has been generally called as version 2.4. Since we observed that some users have used version 18.104.22.168 and are unable to upgrade to version 2.4.1, we decided to offer a patch. This patch should be applied to version 2.4.1 before starting the upgrade. It contains two files and those two should be applied to following file paths (Paths are shown relative to root of OrangeHRM). upgrade/index.php upgrade/templates/copyConfFiles.inc Download the patch Upgrade instructions Update on 20th March 2009: The patch was updated. Now upgrader will create a log file called upgraderLog.log at upgrade directory in newversion during the data import stage. This will let you know the cause if an error occurred during the import.