We understand that Dropbox has started advising users that as of January 16th, 2018 it will automatically sign out any computers running certain older operating systems and before that, you won’t be able to download or install the Dropbox desktop app on those systems after 3 November 2017.
What Operating Systems Will Be Affected?
The Mac systems include OS X 10.6 Snow Leopard through 10.8 Mountain Lion. For Windows users, Windows Vista systems will also lose desktop support on that date.
That said for users of these older operating systems, it would appear that users may not be completely cut off from accessing Dropbox files. Dropbox says that older systems running a “supported browser” should still be able to access files through the Dropbox Web site.
However, it remains to be seen how long Web browsers compatible with those older operating systems remain “supported.” Dropbox provides more information about the end of desktop support for older systems in its help center.
As we discussed in Podcast 284 following Apple's announcement to drop support for older versions of their Pro Apps with the introduction of macOS High Sierra, this is another example of software developers cutting back on legacy support.