How to upgrade from a factory installed version

Paul, In future please refrain from carrying out multiple topic postings on the same subject! You won't obtain an answer to your query any faster!. Also please try to keep the whole conversation in one question/thread to speed up any resolution. Please see your other posting (https://support.avg.com/answers?id=906b0000000DbJLAA0).
AVG Guru

Having bought the upgrade to pro I now find I cannot uninstall the factory-installed version to install Pro as instructed by the email. How can I upgrade my version to Pro?

Hello Paul,
We regret for the inconvenience caused. It seems that you are unable to submit a request to our AVG Mobile support team to get your issue resolved regarding your issue with your Android device, so we will escalate this to our AVG Mobile team and they will check that for you. Please reply back to confirm whether we can escalate this or not, so that we can proceed further.
Please feel free to contact us for any assistance regarding AVG.
Thank you.

Paul, In future please refrain from carrying out multiple topic postings on the same subject! You won't obtain an answer to your query any faster!. Also please try to keep the whole conversation in one question/thread to speed up any resolution. Please see your other posting (https://support.avg.com/answers?id=906b0000000DbJLAA0).
AVG Guru

Why do I get this message when I try to post an ask:

Insufficient PrivilegesYou do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary. For more information, see Insufficient Privileges Errors. 

This is why I sent an ask twice. The capcha doesn't seem to work on Ubuntu.

I would refrain but I got no indication that my question had gone through. Add that to the non-working lionks AVG sent me is already making me regret my decision to upgrade in the first place.