Hello. I'm trying to start on the Build A Data Model for a Recruiting App Project. https://trailhead.salesforce.com/projects/build-a-data-model-for-a-recruiting-app/steps/create-a-custom-object-for-reviews It asks that I install an unmanaged package but when i click on the link provided it says the app cannot be installed because the package is not found. 
"The requested package doesn't yet exist or has been deleted. If this is a recently created package version, please try again in a few minutes or contact the package publisher."
I need to understand roll-up fields (starting from the basics) so i need to complete this or is there another, newer module that will explain it better?

I am on the Trailhead = UX Prototyping Basics: Iterate on Your Prototype and I cannot get the Apex Controller, limit the account, contact and lead SOQL to return 5 records.  Can someone help me with what the code should be for this?

Hello All,

I keep getting this error on this question:

Challenge not yet complete... here's what's wrong: 
An update to an account record failed to update the mailing address fields of all child contact records. Make sure that the process is correct and that it is activated.

Screenshot:
https://www.dropbox.com/s/30lrmgz8zogxulf/Screenshot%202015-03-23%2016.09.38.png?dl=0

Screenshot 2:

https://www.dropbox.com/s/5wrdht63l18591b/Screenshot%202015-03-23%2016.10.57.png?dl=0

I have gone over this many times and I would appreciate any help to get through this challenge!!


Thanks!