Some users need Pages 11.1 because a collaborator uses it and newer versions break formatting. Instead of hunting a repack, try:
Unofficial DMGs are a common vector for injecting malware, adware, or keyloggers into macOS. Pages 11.1 Dmg REPACK
You lose access to the latest security patches and features provided by the Mac App Store. How to Install Pages Safely Some users need Pages 11
Pages is deeply integrated with iCloud. A cracked version could intercept your iCloud credentials or access your Apple Keychain, compromising your entire Apple ID, including saved passwords, credit cards, and personal data. compromising your entire Apple ID