Books suddenly stopped working, clicked on Sample, but cannot buy book
HOW TO GET BOOKS TO OPERATE
MacBook Air 13″, macOS 11.6
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Restart your Mac, and try again.
If that fails, boot into Safe Mode, and try Books again.
If there are any add-on anti-malware apps, add-on anti-virus apps, add-on VPN apps, or add-on cleaner apps, or similar, remove all of those per the vendors' instructions, and try again.