The App Paths directory search doesn't check that lightcraft.exe exists, and
when the old installers' unquoted path is gone, Windows Installer falls back
to the text before the first space: a deleted
C:\Program Files\LightCraft\lightcraft.exe resolved to C:\, so an upgrade
would install into the drive root. Gate the fallback on a second search of
the same value with a FileSearch for lightcraft.exe.
The install-folder test gains legacy-folder-deleted (failed before this fix)
and legacy-exe-deleted cases, and removes its empty parent registry key.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Chad ElliottandClaude Opus 5.5
a82ecb3753