Free v Paid for

Hello Andy, 
Thank you for contacting AVG Community Support.
We understand that you want to know about the AVG Internet Security and AVG Ultimate bundle. We'll certainly check and help you out.
AVG AntiVirus Free is a security application that helps protect your devices from viruses, malware, phishing, and other threats.
AVG Internet Security is an application that helps protect your devices from viruses, malware, phishing, and other threats.
AVG Internet Security includes all of the free features (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Antivirus-FAQ&supportType=home#idt_2305) that are included in AVG AntiVirus Free, as well as the premium features (https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Antivirus-FAQ&supportType=home).
An AVG Ultimate (Multi-Device) subscription allows you to use each of the 4 product packages listed below:
AVG Internet Security | AVG TuneUp | AVG Secure VPN | AVG AntiTrack
You can activate AVG Ultimate (Multi-Device) on up to 10 devices simultaneously, on the platforms of your choice (Windows, mac, Android, iOS).
Refer the following article to know more about AVG Ultimate: 
AVG Ultimate subscription bundles - FAQs (https://support.avg.com/SupportArticleView?l=en&urlName=avg-ultimate-faq&q=ultiamte&supportType=home)
You can reach our AVG billing & sales team using this link: https://support.avg.com/avg/en/ww/home/current/contact and they will check and help you with purchase.
After clicking the above link, select Account and Billing -> Purchase and Renewal help ->Get Support -> Voice call or Chat.
If you have any queires, do let us know. 
Thank you and keep us updated.