The package is currently not maintained and up for adoption. If you are interested in taking over as maintainer, please send an email to karthik.ram@gmail.com.
If we can't find another maintainer before something breaks on CRAN, the package will be archived. 🙏 🚨🚨🚨
The rdrop2 README file says
If this happens, it'll be a drag...although there is programmatic access to Dropbox. Ugh.
Anyway, something to keep an eye on.