DVD43 is a free of charge plugin for the 1Click DVD Copy software. It is developed by Captain Red, but there is no contact information available. I suggest you check the PayPal transaction confirmation message and use the information that you can find there to contact an official. In order to update the software, navigate to the official website, click on one of the three provided links and wait several seconds:
After that, save the file to your computer and install the utility following the on-screen instructions.
Note: Unfortunately, you can't use the standalone version of the program anymore, because it has been discontinued and it is no longer supported.