I just found that I could not compile from command line because the dotNET framework version 4.5 is not installed on my computer (running Windows 8.1). Oddly enough, the IDE works and compiles fine.   According to:   http://docwiki.embarcadero.com/RADStudio/Rio/en/Installation_Notes   ---- Attention: You need to have .NET Framework 4.5 or later installed on your computer to successfully install RAD Studio. If the installer cannot find .NET Framework 4.5 or later installed on your computer, it prompts you to download and install it to continue with the RAD Studio installation. ----   The installer should have prompted me to install it, but it didn't. I used the installer from the downloaded DVD image.   Is that just a fluke? Did anybody get this prompt?