Not able to match needed Rust version

[DeepakGarud]

Version
Fastly CLI version v10.19.0 (33a2854)
Built with go version go1.22.12 linux/amd64 (2025-02-27)
What happened
I am not sure if this is a Fastly problem or Rust problem, but since Fastly needs an older version of Rust, I thought I could report it here.
I installed Fastly and Rust (on Windows 11). Rust was version 1.85, which is not yet supported. So, I tried to find and older installer for Rust, but I wasn't able to find it.
I tried to get an older version as per this page:
https://users.rust-lang.org/t/how-can-i-revert-to-older-version-of-rust/20497/5
but after doing:
rustup default 1.84.0
(and the command did work without errors)
I still see output of
rustc version
as

rustc -version
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2025-02-20, rust version 1.85.0 (4d91de4e4 2025-02-17)
The solution may be as simple as keeping the older compatible installer available for download, so it works after a clean install.
Thanks for understanding.

[kpfleming]

Unfortunately we aren't able to assist you with getting a proper version of Rust installed on your computer. You will need to install Rust 1.83 and ensure that version gets used; the documentation for rustup should be able to help you learn how to do that.