Failed to install Homebrew Portable Ruby (and your system version is too old)

Question

I'm trying to install Homebrew on macOS. Once the installation finished, when I typed help I got:

Already downloaded: /.../Library/Caches/Homebrew/portable-ruby-2.6.3.mavericks.bottle.tar.gz
Error: Checksum mismatch.
Expected: ab81211a2052ccaa6d050741c433b728d0641523d8742eef23a5b450811e5104
  Actual: f80fd4cc877a64b0ac1c105fdc212ca6be08bb034118900f2c2f58edcfe0dafd
 Archive: /.../Library/Caches/Homebrew/portable-ruby-2.6.3.mavericks.bottle.tar.gz
To retry an incomplete download, remove the file above.
Error: Failed to install Homebrew Portable Ruby (and your system version is too old)!

Answer 1

I had the same question, and the solution is simple: remove the portable-ruby-2.6.3.mavericks.bottle.tar.gz you downloaded before.

rm /.../Library/Caches/Homebrew/portable-ruby-2.6.3.mavericks.bottle.tar.gz

Answer 2

Try running brew update-reset in your terminal and then run brew upgrade in the same terminal.

Answer 3

"Homebrew install fails with Error: Failed to install Homebrew Portable Ruby" helped me tremendously.

It would fail to install, because our company firewall was blocking certain downloads, like bottle, during the Homebrew update/install, but it was difficult to determine this because I would get the error above.

After removing the file, try

brew upgrade
brew update

on your personal Wifi or your phone's hotspot.

Answer 4

I fixed it.

First, I deleted the brew file that stores in the Library folder when using macOS.

The failure before was due to the connection. When I make sure the connection worked, it worked.