Mac and Windows users, try this:
Right click the WoW folder > Get info
https://imgur.com/a/Imd27qY
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Click the Unlock item on the bottom where I marked it
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It will ask for your admin password
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Type it and click on the cog dropdown button
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Apply to enclosed items then lock it again from the lock icon
This worked for me and I’ve been able to open WoW every time and play just fine so far. Hopefully this will work for you guys while they work on a permanent fix.