Obviously, the error message appears at the end of the setup after you've installed all add-ons.
The following packages do not support the 64-bit version of Installation Manager that you are using: IBM Connections 18.104.22.168. If you continue, you might have issues with installation and deployment. For information about 64-bit mode support for a package, see the package documentation.
The 64-bit version of Installation Manager checks each package for 64-bit support. If a package does not support the 64-bit version, you receive a warning.
Use a 32-bit version of Installation Manager to install the package.