Hello, there is a file to download which name is medieval times - season 1 complete (for Mac or for PC, at least). It is a text file. Open it. Copy the text you find inside, into your browser upper bar and go to this internet page. Then download (with MEGA will be longer, but you'll get it, with the other link not sure) the file. Then unzip it. Then put it in the directory :
Library/Application support/itch/apps/medieval-times
This Library is not the one under the root of your computer, but the one (possibly not visible) under your home directory. You can reach it with the command "go to..." in your upper bar tool. At least, for Mac it works.
Hope that may help.