What I can see is that you did not paste the .dll and the config file in 'C:\Program Files\Telerik\Test Studio\Bin\Plugins\' folder, but in 'C:\Program Files\Telerik\Test Studio\Bin'.
Can you ensure they are copied at the right location and give it another try?
If this does not work, can you check the Test Studio log file to see if there is any exception when the test list is run?
I'm not aware of any limitations for a 32 bit Windows, but the source code of the plugin is also available in the forum post, so you can modify it and build it at your environment first, then add it to the Plugins folder.
Please tell me if the above suggestions worked for you.