LilyLC: The answers you flag up do not help. There are two interlocking issues - maybe three.
1 PowerPoint, in my case, wants me to download these font files, which are all Chinese. I do not need or want them. I would appreciate advice as to how to get the download request turned off, or an assurance that, if I did download them, they are not viruses and that Powerpoint will then get off its sickbed and work properly again.
2 I am working on a presentation for tomorrow morning - I have been working on it all week. On Friday Night Apple decided to download Sierra onto my computer without warning, and re-booted the machine without permission. After that it offered more information, which turned about to be a whole series of re-boots, taking several hours of my time and not ceasing until 5am Saturday Morning. since the download the normal working Powerpoint askes for these downloads and then crashes. I cannot use it.
3 These unauthorised and intrusive Apple "upgrades" do nothing for my benefit whatever. I don't need or want Siri, for instance. It is only since this upgrade that Powerpoint has asked for these fonts, and now Powerpoint crashes as soon as it is opened, so I can't finish my Presentation, and don't know how I can give it. This is not the first time that unwanted "upgrades" by Apple have ruined my work. Hundreds of hours of film was rendered unusable in a previous unasked for "upgrade" by the abolition of imovieHD and its replacement by an inferior version called simply imovie, which said that the previously loaded films were unreadable.
Frankly, it is about time that someone sued Apple for all the data that it has destroyed in forcing money making upgrades (the cloud is another) on to users. The wasted time and damage caused by Apple's greed is really beginning to make me angry, and where is Apple's complaints line that will deal with this? Apple are very careful to make sure that they are utterly uncontactable.
In the meantime, I DO blame Apple for the failure of Powerpoint, and I would - very urgently - request that someone give me a solution to this problem - I'll download the fonts if I must, but why is it constantly crashing? I repeat, it necver did it before the "upgrade"
Thank You to all the nice people out there if you can help - and I hope one of them is someone from Apple who has access to their own system upgrades to find the incompatibility.