Yes this plugin has been tested on Thesis 1.8.4 as I use Thesis myself.
I have not tested on version below 3.0 as you should be updating wordpress periodically for security reasons and to gain the extra functionality that comes with updates.
That is a difficult one to say for sure, the only way for me to know if through feedback as I don't own all themes. But if it works on Thesis and several generic themes then it should be ok.
Requires: 3.0 or higher
Compatible up to: 3.4.2
Last Updated: 3 years ago
Active Installs: 200+
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