As of June 21st, 2016 WAsP, Wasp Engineering, WAsP Map Editor, WAsP Climate Analyst and the Windfarm Assessment Tool are installed from a single WAsP Suite installer.
The WAsP Suite installer ensures that all the programs included are compatible with each other and it allows you to install any subset of the software.
If you have existing WAsP software installed from previous releases, you can just run the WAsP Suite installer: the older versions will be automatically removed as part of the installation process.
In future, when we release new updated WAsP Suite installers, you can just run them to update your software: there will be no need to un-install anything first.