In this page for installing Zig 0.13.0:

https://zig.guide/getting-started/installation

the text still refers to Zig 0.12.0, rather than Zig 0.13.0. For example,

Choose a build of Zig 0.12 for Linux that matches your CPU architecture. If you're unsure which architecture you're using, this can be found with:

Extract the archive using tar, e.g.
tar xf zig-linux-x86_64-0.12.0.tar.xz

Add the location of your Zig binary to your path, e.g.
echo 'export PATH="$HOME/zig-linux-x86_64-0.12.0:$PATH"' >> ~/.bashrc

Choose a build of Zig 0.12 for Windows that matches your CPU architecture. Most Windows systems use x86_64, also known as AMD64. If you're unsure which architecture you're using, this can be found with:

Verify your installation with zig version. The output should look like this:
$ zig version
0.12.0

These instances of 0.12 or 0.12.0 should all be replaced with 0.13 or 0.13.0.