QuickBooks’ installation procedure seems to gain or lose a few steps—and clicks of the Next button—with each new version. Still, you only have two basic options: install the program from scratch or upgrade from a previous version. When you upgrade, you can run both versions on your computer at the same time, which is essential if you’re an accountant or bookkeeper who works with company files from several different clients. But if you use QuickBooks to run your own business, there’s not much point keeping two versions around. Once you open your company file in a new version of QuickBooks, it won’t run in the earlier version (see the box below). Either way, this appendix walks you through the installation process.