Then look for reviews of this specific software on web sites, in magazines, from email newsletters and lists, and other media. Another route is to subscribe to magazines that have software reviews. There are several Internet locations for software reviews. You can browse the information on these sites, but it's endless. It is more efficient to identify likely titles and then use the search engines to find reviews on that product.
Most distributors favor the newer machine markets.
Several publishers do continue to market older software. Discontinued software can be found on the Internet. There are more and better programs for then new machines. Most software reviewers will explain their criteria and bias. Try to find a source whose bias closely matches your criteria and intended use.