I am going to throw together a guide to uninstalling the latest version of flash player as there have been numerous complaints of 126.96.36.1997 ActiveX Variant not working, and rolling back to 188.8.131.52 working successfully. I have seen people getting the 1722 error according to this thread
I am going to go over a few things so everyone understands some technical things I am going to attempt to simplify for non tech savvy users.
Here is what you are going to need to do to properly downgrade on a Windows XP, Vista, or Windows 7 machines. All of this will be outlined below
1) Run Adobe Uninstaller see B
2) Install the Archived Flash Player version from Adobe archive. See C
A) There are 3 type of flash player plugins, and they all have to be installed separately, so when I get to the part about running the uninstaller remember that you will have to re-install per browser plugin type It is important to note that you can have different versions here as well because not all browsers and applications use the same plugin remember this.
i) NPAPI - this is for Firefox most notably
ii) ActiveX - Internet Explorer/EDGE(windows10)
iii) PPAPI - Opera browser
B) Adobe Flash Player Uninstaller helps out a great deal when downgrading Flash Player Versions, running that prior to getting an archived version helps out a great deal. You can grab the Adobe Flash Player Uninstaller here
C) You are going to have to grab the Archived ActiveX variant from the Adobe Archive here. This is a ZIP file, so you will have to open it and I suggest using the exe as that is what one person said works that file is called: flashplayer20_0d0_228_winax.exe That is in the folder called 20_0_d0_228 inside the zip archive. NOTE: DO NOT USE THE DEBUG FOLDER
Windows 8 and 10 are a lot different and some of this may not work, however for Windows 8.X users you will have to Uninstall Windows Update KB3132372, that seems to roll it back according to one user i suggested that to. You might want to read that thread as it contains additional information, but you also have to refuse the update in the future as well. DO NOT RUN THE ADOBE UNINSTALLER AS IT WILL NOT UNINSTALL THE FILES ON THESE OPERATING SYSTEMS.
On Windows 10 it is a lot different as Automatic Updates are installed be default without any control by the user on Windows 10 Home ( the update is the same number btw ). I use an application to prevent windows updates on my Windows 10 pro machine called wushowhide.diagcab . This is provided free of charge from Microsoft. There is a great article on how to use this here, as well as the official Microsoft Download link in that article. I have no way of knowing if this works on all Windows 10 Variants, however there does not seem to say there are any restrictions for Windows 10 Home, Pro, or Enterprise Version.
Hopefully this will help out some people trying to roll back to 184.108.40.206 version. Below are some additional information that you might need
1) If you need Flash for Firefox NPAPI version the most current version is here to install directly. This is for Firefox mainly
2) IF you need to preform a clean uninstall based off you operating system, or you need to do this for multiple machine I have a clean uninstaller. To get that, click on my name in these forums, in my profile there is a sourceforge link. Click browse all files under the big green button, then choose the uninstaller only. This will remove some additional Operating system files based off your Operating system and some misc cache files. Windows 8.X and Windows 10 will only remove the cache files not the Operating system files. The clean install process is usually for Windows XP through 7, however I simplified it down to a one click BAT file for all Windows Operating systems. You might want to try this if you are having problems rolling back.
3) There have been some known old registry entries from older flash player versions that can cause conflict with newer installations on machines that have not been imaged in years or flash has not been properly uninstalled and there are residual files, etc left over, that will not be covered here as that is an advanced topic
I hope this helps out some people having issues