Missing datachannel.dll

This could be an error that is specific to the application you are working with. One thing that can be a key to troubleshooting the issue is identifying where the messages are coming from. If you feel comfortable doing so, providing the name of the application you are trying to install could help the community to better understand the problem. Other factors you might consider including are if you are performing an upgrade from a previous version, if you recently uninstalled a similar program, and/or if you may have recently un/installed a different program prior to attempting the installation of the app in question. Sometimes error messages like this can occur if the file is being used. If you have an older version installed or attempted to uninstall an older version prior to the installation, you might try logging out and logging back in or doing a full restart (simpler). Sometimes applications can leave artifacts from their previous installs. It's always good to double check when doing an application upgrade that requires a previous version to be removed.