On the page that opens you should see a link named Just click that, then it will download and you should be all good.Download and run minecraft_with java -Xmx1024M -Xms1024M -jar minecraft_(Mirror) nogui.
I found a decent launcher which includes both this and a nice world/installation backup manager.
Download/launcher/Its an older version of the launcher and works just fine for me now :) Thank you for your interest in this question.
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For instance; players can install multiple mods of similar functionality without any glitches or errors.
On the other hand developers can hook their mods rightly without worrying about conflicts with other mods.