I couldn’t find this specific version online anywhere so if you have a Matador 105 hand scanner (or similar) and you need a copy of PowerScan Professional for the Atari ST you can download it here.
Version 1.03. Hardware and software design by Chris Allen. Released by Power Computing Ltd.
The Matador 105 Atari ST hand scanner was featured in my September 2020 Projects & Pickups video:
Watch on YouTube: https://www.youtube.com/watch?v=L2QiyUAKIIM