Homebrew安装失败，并显示错误:无法安装Homebrew Portable Ruby

一些信息:

• 我没有计算机的管理员权限
• 运行Mac Catalina 10.15.5
• 我使用zshell
• 我有Xcode命令行工具11.5，但没有XCode本身
• Ruby -v = ruby​​ 2.6.3p62(2019-04-16修订版67580)[universal.x86_64-darwin19]

在自制程序页面上运行安装命令时，出现以下错误:

When running the install command on the homebrew page I get the following error:

==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.6.3_2.yosemite.bottle.tar.gz
################################################                                                                                                                                                           24.1%
curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
Error: Checksum mismatch.
Expected: b065e5e3783954f3e65d8d3a6377ca51649bfcfa21b356b0dd70490f74c6bd86
  Actual: be732ceabd97bbe69929621075c00c2e1709e30b8ab9a9ba3b7064a14ad6bbff
 Archive: /Users/e113991/Library/Caches/Homebrew/portable-ruby-2.6.3_2.yosemite.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)!
Failed during: /usr/local/bin/brew update --force --quiet

正在运行啤酒医生只是提醒我:错误:无法安装Homebrew Portable Ruby(并且您的系统版本太旧)！

Running brew doctor just reminds me that: Error: Failed to install Homebrew Portable Ruby (and your system version is too old)!

请注意，它正在安装优胜美地，而不是Catalina.为什么?我试图将它克隆到我的usr/local目录中，但是我没有写权限.我已经尝试过其他所有关于*的解决方案.

Notice it is installing yosemite, not catalina. Why? I tried to git clone it to my usr/local directory but I don't have write privileges to that. I've tried every other solution on * to no avial.