add troubleshooting info

Author: ethanpalm

installation.mdx

@@ -163,4 +163,9 @@ If you use JetBrains, we recommend the [MDX IntelliJ IDEA plugin](https://plugin
   <Accordion title="Issue: Encountering an unknown error">
     Solution: Go to the root of your device and delete the `~/.mintlify` folder. Afterwards, run `mint dev` again.
   </Accordion>
+  <Accordion title="Issue: The update command is not available">
+    If running `mint update` returns the command menu, your current version of the CLI does not include the `update` command.
+    
+    Use `npm i -g mint@latest` to update the CLI.
+  </Accordion>
 </AccordionGroup>