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R3 is perfectly adequate for maintaining existing Windows VCL or Android 7–8 apps. But for new development targeting modern OS versions, you need at least Delphi 11 or 12.
What’s improved in 2017 R3
For the first time, Delphi could compile (64-bit). Using the new Linux compiler (based on LLVM), developers could write DataSnap or console applications and run them on Ubuntu or Red Hat. R3 refined the runtime library and debugging experience.
: Plug the VCI into your computer via USB and connect it to a vehicle's OBD2 port for power.
Consider using the $WARN SYMBOL_DEPRECATED ON directive to catch obsolete RTL/VCL calls. Allocate at least two weeks for a medium-sized VCL application.
: When the activation window appears, click Following then Start . Select Yes to save a file named FileActivation.xml to your desktop.