I don't know how the payment process works from personal experience - but I would have thought that using PayPal would be no different to any other transaction using PayPal as the payment means
However I tried to renew it again this morning and again Paypal doesn't work.
Can you expand on paypal doesn't work (why, any errors displayed, etc.) ?
You could let it run out, but:
- there would be reminder screens that nag
- by letting it expire you would lose any renewal bonus.
- if you tried using paypal as the payment option what is to say you wouldn't bump into this problem again.
You could uninstall avast when you get the the uninstall point - there is normally a revert/convert to avast free option. I say this because there is a high likelihood of getting offered a discount to upgrade.