I installed latest version of Vegas Movie Studio 17 Platinum a couple of days ago.

When I started the rendering process to create a AVCHD file I get the message that the selected encode format requires the download of an add-on software module. When I proceeded to download the installation failed, code: -1.

I followed the instruction to start the application "Run as Administator" and tried to render the project again. It didn't work, I still got the same message about missing add-on module.

I tested rendering the project to an MP4 file and this seems to work with no problem but I prefere AVCHD files.