Workaround for "calculating optimal upgrade path" JavaScript error (Patreon)

A new error was introduced when the older builds were pulled that generates this message when the launcher is "calculating optimal upgrade path" while existing older builds are installed. To work around the error, follow these steps:

• go to settings
• "uninstall current channel"

The launcher will redownload the latest version but it should no longer have that error. We're working on a fix.