Restart the IDE to try the new runtime. Click the OK button and wait until the file with JetBrains Runtime is downloaded and configured. Installing old runtime versions may render your IDE unusable or introduce new issues. It makes sense to install the most recent version or the version you were asked to try by JetBrains staff. Select the version to install, the higher the number after b, the more recent is the version. Start the IDE, use Help | Find Action (Ctrl+Shift+A or Cmd+Shift+A on Mac), type " Choose Boot Java Runtime for the IDE", press Enter. 
All platforms: download and install JetBrains Runtime via Choose Boot Java Runtime for the IDE action Our IDEs will not run on the older Java versions like Java 8 or 11.
Please note that all the current IDE versions require at least Java 17 version to run.
If you need to change the runtime to a different version, see below. All the products on all the supported platforms already have 64-bit JetBrains Runtime 17 bundled and it will be used by default to run the IDE.
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