Spectra 0.5.6

Changed

• Always show the installation folder selection page, including during upgrades.
• Enable automatic Setup logging for installation troubleshooting.
• Update the application demo image.

Choose the Setup EXE for normal installation or the portable ZIP for an installation-free bundle.

When upgrading from 0.5.4 or earlier, existing settings.ini files need the [performance] section documented in the README.