Use this link to get Gekokujo 3.0:
https://drive.google.com/file/d/0B29QA_i8Xg9iMFYySHBRdDBCVkE/edit
Then download the 3.1 beta patch here (to install, extract all files and then put them into the Gekokujo module folder and overwrite the old files):
https://drive.google.com/file/d/0B29QA_i8Xg9ieWFHX2FnVEkxQjg/view
Alternatively, if you want a game with more content (albeit has numerous random bugs, though definitely still playable), then checkout Daimyo Edition submod (does not require Gekokujo to run):
First, install this: https://www.moddb.com/mods/gekokujo-daimyo-edition-updated-version/downloads/gekokujo-daimyo-edition-30-full-version
Then this: https://www.moddb.com/mods/gekokujo-daimyo-edition-updated-version/downloads/daimyo-edition-3-0-quick-fix-1-and-2
Lastly this: https://www.moddb.com/mods/gekokujo-daimyo-edition-updated-version/downloads/gekokujo-daimyo-edition-31