thanks for the comments !
I finally managed to get it working. Maybe it's my Mac but the.jar installer doesn't work so I uninstalled everything including the exist.org in the library sub-folder which I'd missed out on earlier and was probably throwing up the same error.
Re-downloading.img file seems to work now;
The steps I did were:
.jar installer only installs folder but no application exists
1.uninstall everything (including subfolder in /library/)
2. download .img file not .jar
3. re-install and it should work
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