MoviePlus is a Legacy product that has not been sold by Serif since January 2017. MoviePlus X6 (and earlier releases) are no longer supported and our licensing agreements referred to in the article below are no longer active.
The MoviePlus Unlock Server (discussed below) has been taken offline. The MoviePlus software can no longer unlock any features. Serif can not provide unlock codes anymore, as our licensing agreements do not allow us to provide them without the logging and payment provided by the unlock server, sorry.
The remainder of this article has therefore been deleted as it NO LONGER APPLIES
In case you try to import MTS into MoviePlus software you will be displayed the following:
Therefor you need first to compress the MTS file into different format - mp4 for example.
Normally the camcorder that did provide the MTS file comes with software to convert this file into different format. Such software is available to download from camcorder's manufacturer website.
Alternatively use VLC software to convert MTS files into MP4 easily and free.
See this article - How to Convert MTS Files with VLC?