fix ollama download link

fix #10

Author: copdips

docs/posts/2025/2025-03-07-installing-ollama-without-root.md

@@ -7,18 +7,27 @@ categories:
 comments: true
 date:
   created: 2025-03-07
+  updated: 2026-06-10
 ---
 
 # Installing Ollama without root
 
 Inspired by [the official guide](https://github.com/ollama/ollama/blob/main/docs/linux.md#manual-install), here is my method for installing (or updating) Ollama without root access.
 
+!!! note "Ollama Archive Format Change: .tar.zst Requires zstd"
+    Previously, Ollama provided archives in `.tar.gz` format, but now only `.tar.zst` is available, which requires [zstd](https://github.com/facebook/zstd).
+
+    Therefore, if we don't have root access, we need to prepare the `zstd` binary in a user-local directory beforehand and add it to `$PATH`.
+
 ```bash
 mkdir -p ~/src
 cd ~/src
-curl -L https://ollama.com/download/ollama-linux-amd64.tgz -o ollama-linux-amd64.tgz
+curl -L https://ollama.com/download/ollama-linux-amd64.tar.zst -o ollama-linux-amd64.tar.zst
 mkdir -p ~/opt/ollama
-tar -C ~/opt/ollama -xzf ollama-linux-amd64.tgz
+
+# With zstd **binary** available in $PATH,
+# modern tar can automatically detect and use it to decompress .tar.zst archives.
+tar -C ~/opt/ollama -xf ollama-linux-amd64.tar.zst
 ```
 
 Add Ollama to $PATH: