OK, so after a few uninstalls and installs (in between I got some "unsupported package" messages for some reason) I was able to get it running from the "extras" menu. So that problem is solved.

however, if anyone knows the answer to the previous question, that is, whether I should remove the old installation I made through command-line, and which files exactly to remove, I'd appreciate any pointers.

by the way, its really nice to not have to be root and type long commands to launch the app now. Also I see some stability improvements, like the keyboard not popping up all the time.

Thanks for your hard work!