Users may continue to see this sporadically until updates *after* v6.0.0.62, depending on their individual circumstances. This dialog is only shown briefly (during the download), and this error is entirely benign.
GUIDANCE:
This is an UPDATE from the previous guidance which was 're-install full version'. It turns out that for *some* users, the proper fix will simply not be available until .62. Regardless, this is purely cosmetic, seen only on auto-update downloads, only affects some users, and is benign. It is a side effect of the localization of that dialog. Anyway, ferreted out now for sure .
For those coming from version 5, I *still* recommend a reinstall (over-top) your existing installation - just to be safe.
ACTION:
Wait for v6.0.0.62, and any update after that will not show these brief missing strings.