Latin is not dead, it is alive and its modern dialects are called Portuguese, French, Catalan, Spanish, ....
The relationship between Latin and e.g. Spanish is exactly the same as between Beowulf-era English and the English we’re speaking now. So I don’t understand your argument that Latin is unchanging whereas English isn’t.
The relationship between Latin and e.g. Spanish is exactly the same as between Beowulf-era English and the English we’re speaking now. So I don’t understand your argument that Latin is unchanging whereas English isn’t.