🤖 Devin AI Engineer

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• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

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Yes, this change handles the case where the CLI is already installed in two ways:

1. First, it runs a PowerShell uninstall script that checks for and removes existing Agentuity installations before attempting to install the new version.

2. If the installation fails (including the case where msiexec fails because the program is already installed), the code now has a fallback mechanism that:

   • Shows a warning message about the installation failure
   • Copies the MSI installer to the user's home directory
   • Provides instructions for manual installation

The implementation tries multiple installation approaches in sequence:

1. Direct install with
2. Update with if direct install fails
3. Reinstall with , , and if update fails
4. Fallback to manual installation if all automated approaches fail

This ensures that even if the automatic installation fails for any reason, the user still has a way to complete the upgrade manually.