Currently, only phones that are officially supported by Carbon are supported. To install the rom, we currently recomend using Rom Installer by jrummy. The download is currently handled by the stock installed browser on your phone. If you would like to save the rom to a specific location, set this in your default browser.
NOTE: In the future it is planned to allow downloads inside the application, with notification and md5 checking built in. This is planned, however the estimated time is not going to be provided.
If you have feature requests, please email me and I will try to get them added into the app.