Log in to your JetBrains Account on the website and click the Start Trial button in the Licenses dialog to start your trial period.
You will be redirected to the JetBrains Account website. In the Licenses dialog that opens when you start IntelliJ IDEA, select the Start trial option and click Log in to JetBrains Account. If you use two-factor authentication for your JetBrains Account, you can specify the generated app password instead of the primary JetBrains Account password. IntelliJ IDEA will automatically log you into your JetBrains Account if you're using ToolBox to install JetBrains products and already logged in there.
After installing the IDE, log in to your JetBrains Account to start using the IntelliJ IDEA's trial version.
You can evaluate IntelliJ IDEA Ultimate for up to 30 days.