When i am trying to install HealthCloud package into my dev Org, there is an error and installation getting failed

Hi @RAHUL PATIL

there was a similar issue reported multiple times, it seems that a solution is to raise a SF support case and they will provision the licences.

https://salesforce.stackexchange.com/questions/346655/unable-to-install-health-cloud-package-despite-having-licence-and-assigned-to-a

You can raise a case by going here: https://help.salesforce.com/s/case-submission