What is the best way to configure target platform to develop Eclipse RCP application? Download 'pure' Eclipse and add only needed plug-ins in project or download Eclipse for RCP and RAP Developers? And what is better solution to add plugins? Open Eclipse-TP and download from eclipse-marketplace or manually copy jars to appropriate folders?
It depends on the set of plug-ins your RCP application depends on.
If you want to release on multiple platforms, also download the DeltaPack, which contains platform-specific resources for multiple platforms.
By the way, if you're adding the target platform to version control, use binary type for the following files in plugins/*/META-INF: