hi and thank you for your work on Tabula! Well, some months ago I've advised to try Tabula and the first thing was the Java download page opened without any explanation. She managed to install java runtime and to try again but when was trying to upload files it was displaying either internal server error in jruby message or just a plain json in the browser. So, in my opinion and experience it may require some efforts to run it (at least for the first time). But to _use_ it, for sure, no such a technical background is required.