QuickBooks Desktop is the accounting software that has led the way since its inception in 1991. With so many businesses using QuickBooks 2021 Download, it’s no wonder it continues to remain a top-selling product. Yet, despite its popularity, many users find themselves unable to download or install this software due to compatibility issues with the newest operating system. In other words, if you need QuickBooks to run on your computer or laptop, but you’re using an older Operating System like Windows XP or Windows Vista, then you probably have experienced difficulties installing and/or running QuickBooks Desktop on your computer.