After uninstalling avg zen I can not install an older version of avg

Iva,
We understand your concern, we apologize for the difficulties. We would request you to uninstall your AVG as suggested here: http://avgclick.me/UninstallAVGAV

Kindly download your AVG remover and run it, then go to C: drive -> AVG Remover -> Bin -> pctremover.exe and avgfmwremover.exe (do not restart your device if prompted), then run avgremover.exe (it will automatically reboot your device).

Then please remove AVG folders manually as suggested below. Go to Run window (press windows key and R key simultaneously) and type the following comments to delete the folders.

I uninstalled avg zen using this link: http://aa-download.avg.com/filedir/util/AVG_Remover.exe
But some folders of avg zen are still on my computer and I can not delete them.
I wanted to install older version of avg anti virus using this link: http://files-download.avg.com/inst/mp/AVG_Antivirus_Free_x64_693.exe
I got this message: 0X001F94E: Update cannot proceed due to source/target version mismatch.
I have windows 10.
First question: How to delete folders who remained after uninstall of avg zen
Second question: How to install older version of avg anti virus (compatible with windows 10)
Thanks in advance
1. Type  “Temp” and press enter, remove all the files.
2.  “%temp%” and remove all the files.
3.  %appdata% - Remove all the AVG folders.
4.  %programdata% - Open the AVG folder and remove the old files.

Please go to c: drive-> program files and delete the AVG files.  

For second  query, we are sorry, we have updated our AVG program into 2017 version and therefore it is not possible to install the older version of AVG. You will not receive the virus definitions update to protect your device fully.

We recommend you to install the newer version of AVG from our official website: http://www.avg.com/us-en/download. Thank you!
Iva,
We understand your concern, we apologize for the difficulties. We would request you to uninstall your AVG as suggested here: http://avgclick.me/UninstallAVGAV

Kindly download your AVG remover and run it, then go to C: drive -> AVG Remover -> Bin -> pctremover.exe and avgfmwremover.exe (do not restart your device if prompted), then run avgremover.exe (it will automatically reboot your device).

Then please remove AVG folders manually as suggested below. Go to Run window (press windows key and R key simultaneously) and type the following comments to delete the folders.