No, this version is not compatible with Windows 8.1. On the developer's page, a new product is released and it's called Sage 50 Accounting. If you visit the website, you will see that the product comes in multiple versions, each configured to meet certain requirements. Visit the website to find more about this new product. On the side note, it's actually Peachtree Accounting only that is renamed and upgraded to reflect latest changes in finances and accounting business.