For those who may want to have a copy of their builds, bases etc from the previous world from PureSurvival (MC 1.14.4):

You can click here to download the world.

Please be aware that it is a large zip file (over 1.5 GB). And may take a while to download.
You will need to extract the zip file and move it into your single player saves folder (or onto a server) to open the world.