I am having a similar problem. Dropbox stopped syncing and now I can't get it to run, even running as Adminstrator.
Uninstalling fails. I have followed your solve above, but it requires uninstalling which fails!
Using the offlineinstaller I got it to reinstall but it won't start still. Now it says dropbox/client/dropbox.exe can't be found even when I am running dropbox/client/dropbox.exe directly from the dropbox folde! Same when running as administrator.
Please help. I am running Win 10
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