help updating an old project

I would like to see the source code to a old pokemon movement engine on the game maker legacy forums. My issue is the file is a .gmk, but there does not seem to be a way to open it in game maker studio 2. Could some one with a older version of game maker studio update the .gmk so I can view it?

I know the project probably will not work once it is updated, but i just want to see the source code.

link to project:"pokemon"

Thanks in advance!