I am using magento version 126.96.36.199 i try to install security patch SUPEE-7405 i have downloaded the files from magento site with name of "SUPEE-7405 for CE 188.8.131.52-184.108.40.206 (0.12 MB)" i used this command "sh PATCH_SUPEE-7405_CE_220.127.116.11_v1-2016-01-20-04-42-03.sh" after installing i am not able to login admin it show blank page in system.log it says "include(Mage/Core/Helper/UnserializeArray.php): failed to open stream: No such file or directory" but this file not exists in Magento version 18.104.22.168 its available in version 22.214.171.124. Do i need to upgrade the magento version and then install SUPEE-7405 for CE 126.96.36.199-188.8.131.52 (0.12 MB) or any other solution to fix the issue.
Could you mention the exact Magento version you are using?
Your question headline mentions 184.108.40.206 and the content section mentions 220.127.116.11.
Both versions have separate patches.
18.104.22.168 SUPEE-7405 for CE 22.214.171.124-126.96.36.199
188.8.131.52. SUPEE-7405 for CE 184.108.40.206-220.127.116.11
Check if you have downloaded the correct version of patch. If you have applied the correct patch try to clear var/cache and var/session folder then login.