Actually in order to complete trailhead module i installed this package but couldnt found the 'Recurting' application. So i thought to gain installed it but it shows me conflicts and even i couldnt found the package in Setup to uninstall it .Package Name: Recruiting App Package and i installed it in production.
I tried and was able to successfully installed and view it. Not sure if something is missing.
Check below issue which has a similar issue: https://salesforce.stackexchange.com/questions/122962/i-am-not-able-to-find-recruiting-app-in-my-developer-org
If you still see issue kindly log a case with trailhead support.
You should be able to check list of packages here.
Setup-->Installed Packages
Thanks,
Permission is already given still i cant able to see the package under Setup-->Installed Packages
Check below issue which has a similar issue:
https://salesforce.stackexchange.com/questions/122962/i-am-not-able-to-find-recruiting-app-in-my-developer-org
If you still see issue kindly log a case with trailhead support.
https://trailhead.salesforce.com/help
Hope this helps...
Thanks,