Previous releases of Studio should generally not be used. However, if there is an issue with the upgrade to the latest version, you can manually install a previous version of Pricefx Studio.
Download a build of previous Studio version from page Builds (Pricefx Studio) to your download directory. Do NOT unzip.
In the IntelliJ IDEA Windows version, click 'File' and select 'Settings'.
In the Mac version, click 'IntelliJ IDEA' and select 'Preferences'.Open the Plugins tab.
Search for "pricefx-studio-idea" and click "Uninstall".
Click on Tools icon > "Install plugin from the disk..." and choose the ZIP from the first step.