Error: We couldn’t complete the updates, Undoing changes. Don’t turn off your computer.

I am in full agreement with  and Ron. I too, had dropped a post much earlier and work on those suggestions. I too, hope the mid-May update would install successfully, but it does not.

As a user, we (system) have been installing all updates smoothly until this version comes along. Implications - no issues with the system. The issue is this update that require something more from the other updates. And it leads to all kind troubleshooting that I and many users never had to do before. The point about disk space, I am irritated as well since my harddisk has LOTs of space - 322Gb free. If there is a need for partition for this installation, are the users require to take care of this now? If yes, there has to be a proper set of instructions and I mean - complete instructions trouble-shoot this update root causes.

Some users incidentally have their problems resolved through some suggestions, but the approach just does not seem complete / thorough as a leading major software company.. (I am surprised..)  

I saw the latest email that it is unlikely that there will be another update. So probably there will be no further updates to my laptop which is just a year+ old. It's a really disappointing incident...

You and other similar posters are taking the users into the tall weeds for which there is no resolution. 

I am a user in a peer-to-peer forum, writing for anyone who reads what I write.  A diagnostic approach to problem solving is occasionally successful.  Sometimes there is insight gained that way which provides a useful workaround.  Often there is insight gained that way about how things actually work (e.g. blackbox reverse engineering analysis) which then can expedite analysis of subsequent similar or related cases.  Sometimes the result of diagnosis is clear proof that looking for a simple workaround is likely to be ineffective, thus making yielding to coarser resolutions, such as a rebuild procedure, more tolerable.  Etc.

 A diagnostic approach to problem solving is occasionally successful.  Sometimes there is insight gained that way which provides a useful workaround.  Often there is insight gained that way about how things actually work (e.g. blackbox reverse engineering analysis) which then can expedite analysis of subsequent similar or related cases.  Sometimes the result of diagnosis is clear proof that looking for a simple workaround is likely to be ineffective, thus making yielding to coarser resolutions, such as a rebuild procedure, more tolerable.  Etc.

Thank you for your most detailed response. I am not here to disagree with your most astute observations, however this is a CONSUMER forum. What assistance and relevance to the average user/customer do you think your statement of "Often there is insight gained that way about how things actually work (e.g. blackbox reverse engineering analysis) which then can expedite analysis of subsequent similar or related cases.  Sometimes the result of diagnosis is clear proof that looking for a simple workaround is likely to be ineffective, thus making yielding to coarser resolutions, such as a rebuild procedure, more tolerable." 

Perhaps you are correct but your "blackbox reverse engineering analysis" and "coarser solutions" would be better discussed and served on this forumhttp://social.technet.microsoft.com/Forums/en-US/home rather than a consumer forum. Pardon me but such posts come across as pure gibberish to the average user. 

I am truly puzzled as to why you cannot understand what I am saying. Are you so mired in the weeds yourself that you cannot see that your posts are of little assistance to the average user/customer? Take some time to read your response again from the perspective of the average computer user. It is unintelligible to such users. If you want to makes such posts then they should be made to technet rather than here.

Amen!!!!

Ron - there's no magic fix coming that I can see.  They already released an update to this KB2919355, I don't see another version coming.

You may remember that I was one of the first-in when this thread spawned from the original 105-page epic, and I haven't posted anything since I tested and still failed with the Mk II update on 13 or 14 May because on advice from MS tech support I am waiting until I return home two weeks from now before I risk any more updates.  But I have been lurking and recalled someone else saying something about another potential attempt in the offing.  I had to dig back through the posts to find it but back on page 18 (30 May) gregr2 mentioned that, "I spoke with Microsoft again last night, they said to hold tight they are working on a fix and expect to have it released by the end of June or early July 2014."

Since I 'only' have the OEM key which came with my Surface Pro (from Microsoft!!) I cannot access the retail ISO so I have no alternative but to wait for another update unless Microsoft expect me to pay for my OS twice which is self-evidently unreasonable.  I haven't wasted any time posting in the last month due to lack of time and lack of any sign of progress but this does not make me any less cumulatively irritated and baffled by the lack of action and/or communication from Microsoft.