old updater files are left on disk after upgrade to TB 6.x
Some blog comments indicate that old mar files are being left on disk after a successful update from Tor Browser 5.x to 6.x. Kathy and I have confirmed that this is indeed happening on Windows and Linux.
During the #13252 (moved) work, we moved the update info directory to a (more) consistent place on all platforms but we did not account for the issue of upgrading from older releases. The new location for update info is
Browser/UpdateInfo on Linux and Windows and
TorBrowser-Data/UpdateInfo on OSX.
On Windows, the old location (where files are left on disk and not cleaned up) is
On Linux, the old location is `/Browser (an updates/ directory plus old active-update.xml and updates.xml files are left there).
Another consequence of this bug is that update history information is lost during the 5.x to 6.x update (because the code in TB 6.x does not look in the old place for it after the update is applied).