Well, if it was a paid software then all you're going to be able to find most likely is the demo version. The only place you might be able to find the full version is on a WAREZ-type site. But, we don't discuss those sort of things here. Against our rules here. Also, it's not a very good idea to download from those type of sites. They're usually full of spyware/adware.
In the end you might just have to convince your client that the only option is to use something else.