Today we have the released hotfix 8012. Customers who tried 8011 got failed due to improper data in the Holiday list. This hotfix will solve this issue.

Please download the hotfix from the below link

https://www.manageengine.com/products/support-center/service-packs.html

Issue id - 13372  :  Unable to perform 8011 patch upgrade (This issue is due to improper data in HolidayDefinition Table.)