Did you restart the browser after the installation completed? For Flash Player upgrades, closing the browser is not required, however, Safari, and Chromium-based browsers will not load the new version until the browser is restarted.
Also, based on the file names you've provided you are installing both the NPAPI plugin (for Safari/Firefox) and the PPAPI plugin (for Opera and chromium-based browsers).
The installer files are not incremental versions. These are the online installers which download and install Flash Player silently in the background. You can go ahead and delete these from your downloads directory.
After you restart the browser(s) go to https://helpx.adobe.com/flash-player.html and click 'Check Now' button. What is the resulting system information?
I have a similar problem. I have updated and installed FP, yet keep getting repeated notices to download and install, which interrupt my work. How can I turn off these prompts?