The link to https://dlang.org/install.html is way beyond the fold of https://dlang.org/download.html, and looks like this: Install Script (i) curl -fsS https://dlang.org/install.sh | bash -s dmd-nightly Need to give some exposition here, such as this text: "The dlang.org/install.sh script is the official D version manager for DMD, GDC and LDC on FreeBSD, Linux and macOS. It provides a convenient way to fetch and install a D compiler without requiring administrative privileges nor external dependencies. (i)" Leave off the bash command. The installer documentation makes no mention of -fsS, either. It shouldn't be there if the documentation doesn't cover it.
*** This issue has been marked as a duplicate of issue 17998 ***