- Find the plugin in JetBrains marketplace.
- Go to the "Versions" tab.
- Select the version you want to download.
- Click on the download button.
- Wait to be redirected to a page with a url that starts like "https://plugins.jetbrains.com/files/".
- Replace "https://plugins.jetbrains.com/" with "https://downloads.marketplace.jetbrains.com/".
- Voila.
For IDE's downloads replace with "https://download-cdn.jetbrains.com/".