I am getting an error while installing Truclient standalone 12.56 version
This patch cannot be installed because the required HP software component is not installed. Please install the correct patch
I also tried to install the latest patch from HP site but it says that you don't have permissions for this.
12.56 is a patch version that requires version 12.55 to be installed, as a prerequisite. Note that version 12.56 is not available in the Community Edition.