When running via 'irm ... | iex', the script executes in the caller's
session scope. The 'exit 1' calls (lines 424, 460, 849-851) would kill
the entire PowerShell window instead of just stopping the script.
Fix:
- Replace all 'exit 1' with 'throw' for proper error propagation
- Wrap Main() call in try/catch so errors are caught and displayed
with a helpful message instead of silently closing the terminal
- Show fallback instructions to download and run as a .ps1 file
if the piped install keeps failing
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