Avast internet security was taking like 20 gb hdd space?

Avast Free Antivirus / Premium Security
1

I switched from avast internet security to free and then I realised that i got 20gb more free space on C:…
why is that, and could I delete them somehow if I go againt on internet security?

2

AIS has more parts than the free version.
So yes, the free version takes up less space.
No surprise there.

If you install AIS again, choose custom installation.