Complex sentence: Shipped as a single, stand-alone executable of 170 KiB (as of version 1.6.1 Build 474), the software does not require installation, though an installation program is also available (at 597 KiB).
Split into simpler sentences: Shipped as a single executable of 170 KiB (as of version 1.6.1 Build 474), the software does not require installation. An installation program is also available (at 597 KiB).