This is a patch release of the REvoSim and EnviroGen software containing minor bug fixes and code improvements. This release and the underlying model has been described in detail in the following paper: Garwood, R.J., Spencer A.R.T. and Sutton, M.D. 2019. REvoSim: Organism-level simulation of macro- and microevolution. Palaeontology. The code is archived on zenodo.org: Documentation: REvoSim Online Documentation EnviroGen Online Documentation Change log: The following has been changed since the last release. REvoSim Update in copyright notice dates Moved licence text to a resource file EnviroGen Update in copyright notice dates Moved licence text to a resource file General Updated README file with compile instructions. Updated conditional defines to ensure that the program compiles with pre QT 5.6 Updated icons for all operating systems Release information: Windows A zip containing all required binaries can be downloaded from the assets above. Alternatively an installer is provided. See notes below: Note 1: The .zip archive contains all REvoSim programs (REvoSim and EnviroGen). The .zip can be extracted and the programs run by double clicking the .exe files in the ./bin folder. All the required libraries have been included and are found in the ./bin folder. Note 2: The windows installer will not overwrite any pre-existing REvoSim installations. However, it will set the default program for all REvoSim files (.revosim) to to use the newly installed version. Mac A zip containing the REvoSim programs (REvoSim and EnviroGen) can be downloaded from the assets above. To install the software, drag and drop the required .app folder(s) into the Applications folder. You may be required to the approve the software in security and privacy settings before it will launch. Linux Any Linux users willing to test a Linux build should contact palaeoware@gmail.com. A Linux package is planned for release during Q1 2019.