Do not install a version of On-Screen Takeoff for which you do not have a valid license, you will lock yourself out of the program and your database. If you are unsure if your license supports a particular version, contact Support before downloading/installing the product.
If your licenses supports 3.98, you can activate any build that begins with "3.98", however we encourage you to always install the "Current Version", shown above, as it includes the latest and greatest features, changes, and fixes.