It sounds like a type of sales pitch to me, AOG.
AVG would love you to believe that you really need AVG TuneUp (at £34.99 per year). You don't.
They'd also like you to route your internet traffic through their VPN (for £38.99 every 6 months). You almost certainly don't need to.
At least their Web TuneUp browser extension is free but, again, I don't think that you need it.
Ignore the warning messages or switch to Avast (which,it seems, is the most popular free antivirus software among ABers):
https://www.avast.com/en-gb/index