We've updated the build system to a new, but transitory configuration that will allow the desktop application to support newer module formats (including Buttercup modules with important bug fixes) whilst still supporting Electron's limitations (no ESM). As such several libraries have been upgraded that were previously off limits due to these limitations.
Buttercup's Dropbox client has been upgraded with a new request library for better compatibility. Our Google Drive client has also had the same upgrade, but with additional bug fixes for both shared folders and invalid token expiration response codes. Buttercup's core has also been upgraded to support these improvements.