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.
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INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
I downloaded the required package for Lab 1(b). My "MaxzPitchPackage" installation was successful and I got a confirmation email too. But I am not being able to access the installed app and one move forward with the salesforce lab. I have attached the error message below.
Yeah, this is a new SF bug, apparently for Safari users only, but it doesn't matter. It doesn't affect the labs, the package is installed correctly and working fine, and you can just continue with the lab instructions, ignoring the message. I expect SF will fix it by next week but in the meantime, you could switch to Chrome if you want. But even in Safari, you can just ignore this message and go on,