What do you mean it only goes to 1.7.12? Please choose "Latest" on the Settings dialog, if that is an option. Can you post your spine.log file?
Windows: <user home folder>\Spine\spine.log
Mac: <user home folder>/Library/Application Support/Spine/spine.log
Linux: <user home folder>/.spine/spine.log
You can also try deleting the prefs.json file in the same folder as spine.log, but first please post your spine.log so we can see what is going on. The forum will redact your personal information.