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I have intelliJ 12 30day free software installed with entire project setup and running ; now I have a license received from my company and it is not allowing to register; then realised it is a license of intelliJ 11 version; please lemme know steps to downgrade to intelliJ 11. Like running a patch or what is the solution?
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Revert uncommitted changes You can always undo the changes you've made locally before you commit them: In the Commit tool window Alt+0 , select one or more files that you want to revert, and select Rollback from the context menu, or press Ctrl+Alt+Z .
You can use JetBrains Toolbox to install as many product versions as you like side by side with the automatic update (optional) and rollback support.
The free IntelliJ IDEA Community Edition, built on open source code, is for pure JVM development. The paid IntelliJ IDEA Ultimate is designed for full-stack and enterprise development, supporting a wide range of backend and frontend frameworks and technologies.
All active Java Champions can apply immediately to get IntelliJ IDEA Ultimate for free at https://www.jetbrains.com/shop/eform/javaChampion. Be sure to include the link to your active listing on java.net.
Download and install the old version from this page.
Another option is to use the JetBrains Toolbox App. It allows to install multiple IDE versions, perform rollbacks if needed, applies updates to the IDE and plug-ins, etc.
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My operating System is Ubuntu 18.04 I downgraded my Idea community edition version 2020.3 to 2020.2 because it was causing so much lombok issues by using the following steps:
Step 1 : open ubuntu software search idea community click on channel version select version you wish to install and it will downgrade your version with all settings restored. if you dont want previous settings then just clean uninstall idea 
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