when offering some softwares as a trail version downloads, we need to think careful i learn t that if we want to buy only we use Trail version softwares. Otherwise it leads to damage our site. I felt worry about my page rank. Now i am in that shock.
you shouldnt use software for link submission if you want to keep your pagerank or increase it. It might get bad backlinks and low pr and stuff. Only thing you should use software for is analyzing website and submit to search engines
mm... my take is that the software you bought was spamming heavily. IMO the Trial vs Full version doesn't make any difference when it comes to hurting your site unless the tool itself was spam heavy ... I would stay away from anything that is fully automated unless you code the tool yourself and you know what you are doing. If you don't like to work on manual link building then hire someone else to do it for you.. just my 2 cents..