It's not possible to install, and use, Flash Player 11.3 in your current system configuration as Google embeds Flash Player in Chrome. While it's possible to install a different version of Flash Player and have Chrome use that version, via launching Chrome using command-line arguments, Chrome only supports PPAPI plugins now and 11.3 was not available in PPAPI plugin format when released. Furthermore, 11.3 was released in October 2012 and has not been updated to address any security vulnerabilities fixed since its release, which, if installed would leave your system open to known security vulnerabilities which have been fixed since 11.3 was released.
Thanks for answering my question.
Does this mean I need a fix for Flash Player in order to do this? If so, how do I do that?
Sorry, I don't understand the question "Does this mean I need a fix for Flash Player in order to do this?".
Essentially, what you want to do using your current operating system and browser is not possible.