Re: To understand what not so in another's program (MS). API returns an error, but what not so does not speak.
in this situation all should be. Broke? Roll away!
MS gives rollback 1703 at an upgrade to 1709.
But who knew that the studio breaks not at once and in 2 days and rollback on 1703 it not (there most likely "adjustments of the user" instead of "system", but it is finite because of new "system").
Normally (not at "version" change) there is enough "restore point".
For me that MS such aggressive policy of updates will conduct unexpectedness.