I am new to Ubuntu and Linux and I want to install and use the newest version of the screenwriting software Celtx on Ubuntu 12.04 LTS.

After trying https://answers.launchpad.net/ubuntu/+source/ubiquity/+question/206295 and using

sudo add-apt-repository ppa:dreamstudio/video
sudo apt-get update
sudo apt-get install celtx

I unfortunately had to find out that was a rather old version with a fairly screwed up UI. I then downloaded the newest version from http://download.celtx.com/2.9.7/Celtx-2.9.7-64.tar.bz2 but now I don't know how to properly install it.

I extracted it to /home/username/ (there was no ~/bin/) as described here and I can now launch the application by running the file celtx within that folder (I get asked whether I want to Display, run or run it in Terminal) and it works fine. But I can't get it to launch from Unity.

I tried right-clicking the launcher button and going "Lock to Launcher" while it's running and it does create an icon but clicking it to launch the program does nothing. Also searching for celtx in the Dash doesn't find the app.

And advice on how to properly install Celtx 2.9.7 in Ubuntu 12.04 LTS?