Not able to install-app HRMS 15

Not able get-app properly HRMS 15 in Frappe 15 and somehow i get it but now not able to intstall-app

Failed to connect to github.com on port 443, No route to host

This implies some kind of networking problem on your host Hari-HP-EliteBook-840-G5. Try to do some basic network troubleshooting by pinging by IP address and hostname, connect on port 443 to a different hostname like discuss.frappe.io, etc. There’s something going on with your host or local network that’s preventing you from reaching github and fetching the app.

What version of ERP do you have ? Is it compatible with the HR version ?
Have you tried such an installation:

cd apps/hrms
git fetch upstream version-15:version-15
git checkout version-15
cd ../..
bench --site [sitename] migrate
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