Note that the upgrade offering in Movie Studio 17 will take you to a non Vegas family editing software as said in https://www.vegascreativesoftware.info/us/forum/read-first-movie-studio-18-vs-vegas-movie-studio--130402/

So be warned that the upgrade offering in MS17 as shown below is misleading and hence you should be careful about the consequences, like possible need to purchase codecs.

The offering and the way Movie Studio 18 is announced under the vegascreativesoftware URL https://www.vegascreativesoftware.com/int/vegas-movie-studio/

For more info see https://www.vegascreativesoftware.info/us/forum/purchaed-hevc-codec-to-use-for-video-on-website-it-won-t-play-video--130653/#ca813745 and https://www.magix.info/us/forum/movie-studio-18--1279537/