Update: July 31
Federal Judge Robert Lasnik has at least temporarily blocked DD from releasing the blueprints online at midnight tonight, ABC11 story here. The plaintiffs included eight states and D.C.
The company is run by Cody Wilson (Arkansas). Vox discussed Trump's ambiguous tweet here. Trump has conceded the NRA position that homemade weapons are illegal even if the plans to make them are not. You get to a logical situation that could even parallel child pornography -- in trying to defend the plans with the First Amendment.
So right now the link on this posting can not lead to these instructions.