Some suggest using Shift-Option-Command-R to install the original macOS that came with your Mac. But:
Older installers often fail with "damaged" errors because their security certificates have expired. You may need to manually set your system date back to a year like 2021 via Terminal to bypass this. Recommended Sources macos mojave 1014 6 dmg google drive better
Are you currently downloading from an , or do you need help finding an official source? macos mojave 1014 6 dmg google drive better
This is Apple’s expired certificate trap. Fix it by disconnecting from the internet and setting the date back to 2019: macos mojave 1014 6 dmg google drive better