To confirm, from what website are you downloading flash player installer from, and what is the name of the file being downloaded? Valid Flash Player installers should not be flagged by anti-virus software.
When I run the newest WIN installer downloaded today from the usual Adobe Flash Player Install for all versions page (McAfee deselected), the installer which downloaded, when I run it, it's trying to access "winaproduct.com" to commence the install. What gives? I'm using a different firewall than Norton, but mine doesn't like this either. No install.
Which Win installer? There are several. ActiveX (for IE)? NPAPI (for Firefox)? PPAPI (for Opera)? The installer shouldn't be attempting to downloading anything from that site.
The online installer is a shim-installer that then downloads and installs Flash Player silently, therefore, the shim installer does make some outgoing requests. Could your firewall be interfering with the valid request and redirecting it elsewhere?
This all started when my Firefox 35.0.1 Win/64 began blocking the flashplayer ActiveX (up to date v16.xx.xx). Firefox identified it as Flash Player 11 and deactivated it. When I came to the Adobe Site here to download Flash at get.adobe.com/flashplayer/ , that's when the above occurred. I've since uninstalled FlashPlayer(s) from my PC.
I keep my registry squeaky clean, JUST NOW ran a malware check (OK), and I keep a tight firewall. idk. Maybe the new Firefox has something to do with it.
Website is https://www.mozilla.org. File is ‘install_flashplayer 16x32_mssa_aaa_aih.exe’.
I just tried again and this time I got a different (still unsatisfactory result). I didn’t get the quarantine message from Norton this time but, having gone through the entire process, nothing happened and, 10 minutes later, Firefox is still telling me that Flash Player is out of date. I noted the process step by step as follows:
Plugin Status - outdated plugins
Adobe Flash PlayerShockwave Flash 16.0 d0 vulnerable
click on 'update now' goes to http://get.adobe.com/flashplayer/
click on 'Install Now' goes to http://get.adobe.com/flashplayer/download/?installer=FP_16_for_Firefox_-_NPAPI&os=Windows% 207&browser_type=Gecko&browser_dist=Firefox&a=McAfee_Security_Scan_Plus_FireFox_Browser&du aloffer=false
message : Opening install_flashplayer 16x32_mssa_aaa_aih.exe
click on 'Save file'
message from Norton 360: 'file is safe'
As per instructions - double click on installer
Query: Do you want to run this file? Click on 'Run'
Query: Do you want the following program to make changes to this computer? - Click on 'Yes'
Query: would you like to save this file? - Click on 'Save File'
Nothing happens. After 10 minutes, Firefox is still saying Adobe Flash Player is out of date
The online installer downloads and installs Flash Player silently, which means there are several requests being made in the background. Norton 360 could very well be interfering with these requests. You can either disable Norton 360 during the install, or use the offline installer, which does not make any requests during installation. The offline installers are posted at the bottom of the Installation problems | Flash Player | Windows page, in the 'still having problems section'. There are 3 installer files and you'll want to download the file(s) for the browser(s) you use.