I install the "Lightning Adoption Tracker: Reports and Dashboard" and AppExchange indicates that the package is installed, but it is not shown on the Installed Packages of my org.
I followed the "Installing a package or app to complete a Trailhead challenge" article (https://force.desk.com/customer/en/portal/articles/2710899-installing-a-package-or-app-to-complete-a-trailhead-challenge?b_id=13478) but I get the same result. I tried to install package for all users, only for admins,... but everything still the same.
I make all the steps to install the package, and I´m really sure that is correct, but not works and without it I can´t make the challenge
Someone can help me?

Challenge Requirements
Create a new user with the following settings:
Profile: System Administrator
User License: Salesforce
Username: Must include guestadmin somewhere in it
The new user must be inactive

I created the new user with all the requeriments, but I mistaken typing guestadmin in the username, and when I try to edit user to correct the username I get:

Error: Please do not change usernames in the Trailhead Playground.

How can I change the username to validate the challenge?

I install the "Lightning Adoption Tracker: Reports and Dashboard" and AppExchange indicates that the package is installed, but it is not shown on the Installed Packages of my org.
I followed the "Installing a package or app to complete a Trailhead challenge" article (https://force.desk.com/customer/en/portal/articles/2710899-installing-a-package-or-app-to-complete-a-trailhead-challenge?b_id=13478) but I get the same result. I tried to install package for all users, only for admins,... but everything still the same.
I make all the steps to install the package, and I´m really sure that is correct, but not works and without it I can´t make the challenge
Someone can help me?

Challenge Requirements
Create a new user with the following settings:
Profile: System Administrator
User License: Salesforce
Username: Must include guestadmin somewhere in it
The new user must be inactive

I created the new user with all the requeriments, but I mistaken typing guestadmin in the username, and when I try to edit user to correct the username I get:

Error: Please do not change usernames in the Trailhead Playground.

How can I change the username to validate the challenge?

https://developer.salesforce.com/trailhead/force_com_introduction/data_management/data_import
I've tried 5-6 times now to use import wizard to import the file provided for the Data Management Module of Force.com Basics.  It just continues to give me an "There was a problem uploading the CSV file. Try again, or choose another file."  I've tried this on both a PC and a Mac, Chrome and Firefox and browsing to the file or drag and dropping the file, just get the same error every time.