Improvements:
- Uses curl -I to check which sources are reachable
- Queries GitHub API to get actual version tags
- Compares versions to determine best available release
- Prioritizes official releases (rfxn.com) when available
- Falls back to GitHub releases with version info
- Shows user which sources are reachable and which version will be downloaded
- Longer timeout (15s) for slower networks
cschantz
90f1eaca05