On 07.09.2016 a minor update 155012 for Unofficial Patch 1.5 has been released. The update is backward compatible (so it's not required to install it to connect other players on Multiplayer). You can check the full changes list here (click).
One of the best features are new Unofficial Patch 1.5 and Unofficial Patch 1.5 Minor Update installers! Installers are now as smart as Unofficial Patch 1.5 Launcher - they detect if UP1.5 was installed before, if it's necessary to update configuration files or what minor version you have got currently installed. I recorded YouTube videos showing the installation process: