U++ macOS installation
After downloading the archive, unpack it and in terminal, invoke ./install script. If you do not have commandline toolchain installed, the script should invoke the standard GUI installation of these (you have to wait for installation to finish before proceeding).
Additionally, U++ needs openssl library and automatically installs Homebrew package manager (if it is not installed yet) and uses it to install openssl.
As long as you keep theide (or umk) just in the original directory, nothing will be written outside of it - its "sandboxed". If you get bored with U++ and need to clean the space, simply delete the "upp" folder.
If you move theide e.g. to ~/bin, it will start to write things to ~/.config and ~/.cache.