Downloading Certificate (.cer) and Key (.key) Files From www.opda.net.cn using Thunder 5

Yesterday I applied for a new certificate from OPDA for my friends phone and today the files ware ready (Thanks OPDA!) but I needed 2 OP points in order to download the files, points which I did not have. There is a second option on the site to download using Thunder 5 (Xunlei) download manager, the OPDA link will prompt you to download the web version of Thunder 5 (Xunlei) if you don't already have it installed. After installing the download manager I found out that clicking the link for the .cer and .key files in Firefox didn't do anything, next I tried IE8 and to my surprise Thunder tried to download a files called plugin.php instead of the .cer and .key files. Strangely a search trough the forums didn't yield any results although there are people complaining about the issue but I did find one reference to a possible solution and it was to lower the IE8 Security settings to Low but after trying it didn't work.

I did however find a solution for people running Windows XP SP3 and IE8:
First you need the non-web version of Thunder 5 (Xunlei), you can get it here. Uninstall the Web Xunlei and install Thunder 5.
Now you need to add www.opda.net.cn to your Trusted Zone in IE options. You can do that by clicking on Tools and then Internet Options, now go to the Security tab and click on the Trusted Sites. Now click on Sites and add http://www.opda.net.cn.

Now, back to the OPDA site. Clicking on the link to download .cer and .key files should bring up the Thunder 5 (Xunlei) download window, here you will be prompted to download "plugin.php" file. The problem is that the file is getting fetched correctly but the name isn't changed so changing the "plugin.php" to "XXXX.cer" will get you a .cer file and "XXXX.key" will get you a .key file. The files size should be around 26kb for the .cer file and 887b (or 1kb) for the .key file. If you are getting a 56kb "plugin.php" then there is something wrong and you should reset all the IE security settings and start over.
I have successfully done this on a machine running Windows XP SP3 and using IE8 and have failed to do the same on a Windows 7 using IE8.
If you get it working on any other system I would be glad to hear about it.