@salmanfaris I tried three types which I all found on the net

https://dl.espressif.com/dl/package_esp32_index.json

All I keep getting is an error message
'Error downloading [the link]'

I've been trying to install esp32 on Arduino IDE for days now but I keep getting 'error downloading package' message. I checked the over and over again, it's correct. I even tried installing it manually using GitGUI but it's not working. Please help me.