On 64-bit Windows systems, if OpsCenter language packs or maintenance (triple-dot) releases are installed on top of an installation of version 7.5, an upgrade to OpsCenter 7.6 may fail. For example, if you upgrade OpsCenter 7.5 to 188.8.131.52, an upgrade to OpsCenter 7.6 may fail. See TECH211070 for details.
Please follow if your upgrade failing
and Please follow the following before proceeding for Opscenter 7.6 Upgrade