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Failed to Install Mail Plug-in
When attempting to install the Mail Plug-in, I instead receive a popup that reads, "Failed to Install Mail Plug-in / The file “Info.plist” couldn’t be opened because it isn’t in the correct format."
macOS 12.3.1 AltServer 1.5
EDIT: Fixed by restart of AltServer app. This only happened after updating AltServer, anyway but still potentially a bug.
Same issue occurred with me as well. Mail plug-in would not install after recent update. However, restarting AltServer remedied the situation perfectly. Thank you @Avakining.
Yes, had the same issue.
Had the same issue, but restarting AltServer seems to be the solution.