If you need to downgrade your QuickBooks, it can be a complicated process. You might have to uninstall the program and reinstall the older version.  Convert QuickBooks File To An Older Version. Many people choose to use a free tool called QuickConvert, which converts files and allows you to create backups at the same time. There are many reasons why it is not always best to upgrade your QuickBooks file. Sometimes, the latest version of the software requires a large amount of work and the old version is more efficient. In these cases, downgrade your QuickBooks file.QuickBooks is a popular accounting software which can be used to track your business finances. It makes it easy to track sales, expenses, and more. If you are having trouble with the current version of QuickBooks or if you want to use an earlier version of QuickBooks, you’ll need to downgrade the software. This process will involve backing up the data on your computer and then moving that data over to an older version of QuickBooks.