Please read the following FAQ to learn how to get/capture/rip/download .FLV videos from Flash Player:
FAQ: How to record/download/capture/save Macromedia/Adobe Flash .FLV video HTTP stream from embedded player

For example, you may use one of the following to free methods:

1. Saving .FLV flash files from the cache folder
You may grab .FLV files from the Cache folder of your web-browser.
See our FAQ on getting flash .SWF files for more (only look for .flv files instead of .swf files).

2. Downloading .FLV flash files with any download manager
But when getting 25+ Mb .FLV video files it is probably better to use a download manager.

Before downloading .FLV file with a download manager you need to find its URL. As in case of any other media stream, use
URL Snooper or Packet Sniffer software like free Project URL Snooper.

I had a problem using Project URL Snooper so I used URL Helper instead. But I suggest you to try the latest version of Project URL Snooper, 'coz it is free.

Using URL Snooper software it is easy to find thay say for the following web-page
the following .FLV URL is used
After getting the URL for your FLV file just use any download manager you like to download from the given URL. You may use Mass Downloader, HiDownload, Net Transport, FlashGet, Orbit Downloader or any other download manager (some of them are absolutely free).