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Dhanik Lal SahniDhanik Lal Sahni 

Transform SQL Queries to SOQL Queries in a Lightning App

I am trying to install package for TrailHead https://trailhead.salesforce.com/trails/microsoft_dotnet/projects/transform-sql-queries-to-soql-queries-in-a-lightning-app/steps/set-up-your-trailhead-playground but it is showing error  
Installing this package requires the following feature and its associated permissions: Apex Classes

Apex Classes(classes/Books4EveryoneSampleDataControllerTest.cls-meta.xml) Missing feature
I have creating new TrailHead Playground but still getting same error.  Please help.
 
Alain CabonAlain Cabon
Hi,

Now, I always install the packages using a copy/paste of the URL changing https://login.salesforce.com with the begining of the URL of the targetted playground (I don't click on the click but just a right click for the copy of the target Url). Otherwise, there is often a problem for detecting the right trailhead playground during the installation if you are using many playgrounds like me.

https://login.salesforce.com/packaging/installPackage.apexp?p0=04t1I000001l23N