Fortunately there is a solution for this issue, I have done some research on the Internet and found several articles, tested some options and wrote all the steps that should be followed.
1. Download the Tor Browser Bundle (portable package) on your computer
Go to http://www.torproject.org/download/download.html.en and download the latest stable version of Tor Browser Bundle to your computer. Run the executable: tor-browser-1.3.15_en-US.exe and then you should see a folder with a name Tor Browser located in the same folder where you have saved the .exe file.
In order to run the Tor portable software you should open the Tor Browser folder and click on “Start Tor Browser.exe”
2. Change Tor settings for watching flash videos
Open Tor, then portable Firefox browser will start.
Click on Tools – Add-ons – Extensions tab – Torbutton – Options – Security settings tab – uncheck the box “Disable plugins during Tor usage”. Click on OK.
Click on Tools – Add-ons – Extensions tab – Torbutton – Options – Security settings tab – uncheck the box “Disable plugins during Tor usage”. Click on OK.
3. Install the Adobe Flash Player on Firefox Portable (Tor)
3.1. If you already have Firefox and Flash installed on the computer
If you are using Windows 7 64-bit go to C:\Windows\SysWOW64\Macromed\Flash
(for Windows 7 32-bit: C:\Windows\system32\Macromed\Flash)
(for Windows 7 32-bit: C:\Windows\system32\Macromed\Flash)
Copy the files:
flashplayer.xpt
NPSWF32.dll
and paste them into your portable Tor Firefox browser plugins folder (for me it is: C:\Users\encounter\Desktop\Tor Browser\FirefoxPortable\App\Firefox\plugins)
Restart the portable Firefox
3.2. If you don’t have Adobe Flash installed on your computer (or if you want to install the latest flash version on the portable Firefox)
If you are using Firefox, right click on the link:http://fpdownload.macromedia.com/get/flashplayer/xpi/current/flashplayer-win.xpi and click on “Save Link As”.
If you are browsing using the IE right click on the link above and click on “Save Target As”
Then save the .xpi file on your computer.
If you are browsing using the IE right click on the link above and click on “Save Target As”
Then save the .xpi file on your computer.
Change the file extension from .xpi to .zip, create a new folder and extract the .zip file there. Copy the 2 files:
flashplayer.xpt
NPSWF32.dll
into the Tor Portable Firefox plugins folder (for me it is: C:\Users\encounter\Desktop\Tor Browser\FirefoxPortable\App\Firefox\plugins)
Restart the portable Firefox.
Now you are able to watch Flash videos in the Tor Portable Firefox browser