Download the remote monitoring client for Win500 along with your Win500. Then you can do as suggested above on the remote monitoring client to open the LCD window in its own box, and you can then click one of the corners and drag the LCD window to whatever size you want.
Open the Win500Mon LCD screen in its own window, then use the Windows Magnifier. Start Menu->Accessories folder->Ease of Access folder->Magnifier. You can always pin the Magnifier to the Start Menu so you don't have to noodle down the tree. If this is what you like you don't have to additionally install/run the Win500 remote client. HTH.