Good news - IntelliJ IDEA has a major update, and previous solution from Neo Peng still works.
Recipe step by step:
- open https://zhile.io/2018/08/17/jetbrains-license-server-crack.html
- find link to OneDrive(download link)
- in IDEA, go to Preferences -> Plugins
- select 'Install plugin from disk...', choose downloaded file
- choose 'Activate by license server'
- IntelliJ IDEA 2020.1 and below
- AppCode 2019.3.7 and below
- CLion 2019.3.5 and below
- DataGrip 2020.1 and below
- GoLand 2020.1 and below
- PhpStorm 2019.3.4 and below
- PyCharm 2020.1 and below
- Rider 2019.3.4 and below
- RubyMine 2019.3.4 and below
- WebStorm 2020.1 and below
UPD: see IntelliJ IDEA 2020.1.2 for latest version solution.