Hi,
I'm attempting the following module, where you need to install an unmanaged package.
https://trailhead.salesforce.com/modules/lightning_app_builder/units/lightning_app_builder_custom_comps 
I have followed the following help article's steps exactly
https://force.desk.com/customer/portal/articles/2710899-installing-a-package-or-app-to-complete-a-trailhead-challenge?b_id=13478

However, the unmanaged package is still being installed to my overall Salesforce instance, NOT to my "Trailhead Playground".

Given the challenge checks against the Playground, it is impossible currently to complete the challenge.
Is this a common problem & if so how do I solve it?
Thanks,
Matt



 

IF( MONTH( NOW() ) = 12,
  DATE( YEAR( NOW() ), 12, 31 ),
  DATE( YEAR( NOW() ), MONTH( NOW() ) + 1, 1) - 1

Create a new formula with the same label, name, and data type that successfully compiles.
The formula should be of Date type and on the Case object
The formula should have the name Last Day of Month and the resulting API name Last_Day_of_Month__c
The formula should return the last day of the current month
Check Challenge


Can any one help me to solve this???