So what do I do now?  Did I just waste $259.89?  What do I tell my clients?

I am very sorry sue,  if you do not have another computer with Windows 10, Windows 8.0/8.1, Windows 7, or Windows Vista. you can request a refund and may want to look at our on-line for pc.  You are still able to do up to 20 returns

Here are the minimum system requirements for TurboTax 2012 through 2015 software for Windows Basic, Deluxe, Premier, Home & Business, and Business editions:

Operating System

• 2015: Windows 10, Windows 8.0/8.1, Windows 7, or Windows Vista.
• 2014: Windows 8.0/8.1, Windows 7, Windows Vista, or Windows XP with Service Pack 3+
• 2013 and 2012: Windows 8.0/8.1, Windows 7, Windows Vista, or 32-bit Windows XP with Service Pack 3+

Administrator rights are required to install and run TurboTax on Windows Vista or later.