I have free Avast …now asking to pay subscription..I will have to leave as can’t afford to pay .
No you don’t.
I have been using Avast Free for over 20 years and it meets my needs. Each year you will need to renew your Avast Free registration, but they will also nudge you in the direction of paid Avast Products.
A screen shot of what you see could help as we can’t see what you see.