You need to find out the following...
connectaddress: The IP address of your Asustor machine which runs pyload.
connectport: The port used for the web interface. Usually to access the webinterface you use the url http://connectaddress:connectport
Btw, this port can be changed via pyload web interface > settings > General > Menu > Webinterface > Port (if need be).
listenport: This is the port the ClickAndLoad AddIn listens to. Have a look into pyload web interface > settings > plugins > Menu > ClickAndLoad > Port
Now on your Windows 7 client open a command window with administrative privileges and enter the following:
Verify if your entry is correct:netsh interface portproxy add v4tov4 listenport=listenport connectaddress=connectaddress connectport=connectport listenaddress=127.0.0.1
And delete your entry (if need be - in case you did a mistake):netsh interface portproxy show all
I have read somewhere that if you activate SSL in pyload, then ClickAndLoad would not work. I don't know if this still applies to the current pyload version, but if ClickAndLoad does not work as expected you should opt for disabling SSL. For me this setup works flawlessly. A big "Thank You" goes to Clinton Hall who made pyload part of Asustors App Central choices and my life happier.netsh interface portproxy delete v4tov4 listenport=listenport listenaddress=127.0.0.1
If anyone would like to add the necessary commands for apple, linux,... clients feel free to do so. This only can help other users to get ClickAndLoad running more quickly.