AVG Free only? Zen and Paid AVG can not be installed

And deleted that folder too.

The first one, yes, but the second and the third installation, I got nothing.

Facts: 1. This is a laptop, 2. I have a paid 2015 Ultimate AVG.
History: 1. I did not know the cause of error, so I used my other laptop to connect to certain website (my other laptop does not have an AVG Internet Security), 2. Later, I removed the AVG (using AVG remover, because it blocked my proprietary certificate), and installed other Internet Security product, and it is proofed that my 2015 Ultimate AVG caused this error, 3. Some days ago I removed the other Internet Security product (it is a trial version). Somehow, the Free AVG is installed instead of the paid AVG (I guess I did not logon to AVG when I installed this software).
Today: 1. I removed the Free AVG (succeed); logon to AVG and installed my paid AVG, unfortunately it is failed (no AVG product in the Programs and Features list after restarted my laptop as required by Zen). 2. I used the AVG remover again, restarted my laptop, login to AVG, download the paid AVG file, and installed my paid AVG again; and FAILED again.
My question: How to solve this problem? Have anyone ever experienced this kind of problem? 
Known solution: Install other (not AVG) Internet Security software. What can I do?

Yes, I did, unfortunately it failed again.

Thank you for your patience and efforts Wan. I have sent you an email to your registered email address with further instructions to be followed. Please check for the email on spam or junk folders if it is not present in the inbox. Thank you.

Hello Wan. I certainly understand your concern. I kindly request you to contact our technical support via http://avgread.me/1EnC2iK to assist you better in resolving your issue. Thank you.

  1. Your computer will be restarted automatically. After the restart, AVG Remover will finish the uninstallation.
    NOTE: Once the AVG Remover Tool has done with its process. Please go to the drive where you installed this tool and look for a folder named as "AVG Remover" and I request you to delete it manually.

    To download, install and activate AVG Ultimate program by following the instructions mentioned in this link: http://avgread.me/19OHofR.

    If the issue persists, please do let us know. Thank you.

And deleted that folder too.

The first one, yes, but the second and the third installation, I got nothing.

Hello Wan. I can understand that you have already tried using AVG Remover tool but I would request you to follow the below mentioned instructions and also the links to download the correct AVG remover tool for your PC:

1) First step is to use AVG Remover tool and uninstall your AVG program completely. To download AVG Remover Tool please click on the following link:For 32-bit: http://download.avg.com/filedir/util/support/avg_remover_stf_x86_2015_5501.exe
For 64-bit: http://download.avg.com/filedir/util/support/avg_remover_stf_x64_2015_5501.exe
2) Run the downloaded tool and follow the instructions displayed on your screen.