A Microsoft file hosting and synchronization service.
Yes, same problem here. All files are gone leaving only "symlinks", manually downloading files either produces the same "helper error" that's been posted here or just plain does not do anything.
I've been a paying customer for several years, but I'm about to give up. I wasted my whole day today trying to solve this mess to no result.
There are other ways to "get" office suite so i'm about to switch to dropbox or google.
MS you are basically forcing me to stop paying you AND break the law by this mess.