The installation process of XLSTAT for Mac has changed for the version 2017.4 and beyond. Please follow this guide in order to migrate from the previous installation to the new one.
1- Uninstalling your previous XLSTAT version
Before the installation of the new XLSTAT for Mac, it is required that you uninstall the previous version.
In order to do this, please execute the uninstaller that is located here: Applications > Addinsoft > XLSTAT > Uninstall_XLSTAT. Double-click on the Unistall_XLSTAT application to start the process.
Follow the uninstaller's instructions until XLSTAT is removed from your Mac.
2- Installing the new version
Please download the new XLSTAT version from this link: Download.
Click on the xlstat.dmg file you have downloaded.
Accept the software license agreements then drag the XLSTAT icon and drop it on the Applications folder.
Once this is done, eject the installation drive by right-clicking on it and selecting Eject "xlstat".
3- Launching XLSTAT
Once you installed XLSTAT, head over to your Applications folder then double-click on XLSTAT.
XLSTAT should configure itself for the first startup, opening and closing Excel windows in the process. Once this is done, XLSTAT is all set.
In the future you can start it directly from the Excel ribbon or toolbar, just as before.