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I install illustrator 2021 it appear "The operation cannot complete because of an unknown error.[CANT]. "
I open the window ,i can not construct a new project .
version： illustrator 2021 25.0(64bit)
system : win10 21H1
Sorry to hear about your experience. I'd request updating your app to the latest version.
Additionally, you may try the suggestions given on this community post & let us know if they help.