I can't login to download the app, however I can login to salesforce through the regular developer URL.
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Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
Before you post make sure you check the Help FAQ for an instant solution first. Then, if you can't find it there, you can post your problem here and we'll get to it ASAP (within 24 hours), but be sure you:
post in the right category
INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
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Not sure what you mean - are you trying to install the grader app or are you working on Lab 1b and trying to install Max's Pitch Package. In either case, you should be logged into your SF account already and then click on the link for the package and it will ask you to select the Username again and then start the install.
Please explain more about which you are doing and provide a screencap showing what is going wrong. Thanks!