Question: I installed Quicken 2006 over Quicken 99. I don't like 2006. How do I get 99 back?
Answer: As with any software where you want to revert back to an earlier version the only option is to uninstall the software and reinstall from scratch.
This may not be as easy as it sounds if you have your own data associated with the program and installing the new version updates the format that the data is stored in. Where that happens simply reinstalling the old version will not work as it will be unable to read the converted data. This is one (of many) reasons why you should consider backing up all of the data associated with the program prior to running the upgrade. Then if you do decide to revert back to the old version because you don't like the new one or if the upgrade fails part way through you can then reinstall the old version of the software and restore the backup of the data to put things back exactly as they were before.
In the case of accounting software I do not recommend reverting back to old versions of the software. Anything over two years old is likely to be calculating something incorrectly as legislation changes usually mean that accounting software needs to be regularly updated to meet legal requirements. Reverting back to an old version is only going to work in this situation if you are not using any of the features affected by legislation changes since your preferred version of the software was released. A better alternative if you don't like the new version of specific accounting software is to look at the alternative accounting software that is available and consider switching to one of those programs instead. The best time to install new accounting software is just after you finish processing everything for one year and before you start entering data for the next as that will mean that if you need to start over with a completely new program that you need simply enter the final totals from the prior year as your starting point as that is all that the accounting software usually retains when you roll over the year anyway.
This article written by Stephen Chapman, Felgall Pty Ltd.