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1. Download the previous Studio version to your download directory, do not unzip.
2. In the IntelliJ IDEA Windows version, click 'File' and select 'Settings'.
   In the Mac version, click 'IntelliJ IDEA' and select 'Preferences'.
3. Open the Plugins tab.
4. Search for "pricefx-studio-idea" and click "Uninstall".
5. Click on "Install plugin from the disk..." and choose the ZIP from the first step.

IntelliJ IDEA 2020.1

• 201.2919
• 201.2877
• 201.2845
• 201.2816

IntelliJ IDEA 2019.2

• 192.2923
• 192.2877
• 192.2845
• 192.2815
• 192.2774
• 192.2760
• 192.2737
• 181.2660
• 181.2618
• 181.2573

...