Go to:
Archived Flash Player versions
Scroll down the page until you reach Android section, specifically "Flash Player for Android 4.0 archives"
choose Flash Player 11.1 for Android 4.0 (11.1.115.32). This is the latest version I know of, but if there is one with a number higher than 32 in the last two digits, select it to download. It will download on your Infinity.
You now have to sideload it to the Infinity. This is done by
1. Going to settings, security, and click to allow the installation of apps from unknown sources.
2. Open File Manager and search for the Adobe Flash Player .apk file you just downloaded. It was downloaded to my external flash when I did this. Click on Adobe Flash Player .apk when you find it. This will install the flash player on your Infinity.
3. Go back to settings, security, and click to disallow the installation of apps from unknown sources. You do not want your Infinity to continue to allow apps from unknown sources.
4. Your Infinity now has flash player installed and you will be able to use the browser to go to pages that require flash player.
Hope this helps.