2SendTab Free was meant to be the free version. I’d love give out more free features, but the hours and days of programming I spend on this take an impact on my family life. The truth is that the advertising income of a tool used by only a few thousand people is so negligible (not even half a dollar yet!) that some features will have to be paid for.
SendTab Free was discontinued due to the difficulty of providing two versions by a lone programmer. This way I can focus on making SendTab Pro all it can be and all you'd like it to be.