I can't speak to the German translation, but the point the English version is making is you don't install Snowflake, you install software that uses Snowflake (most typically, Tor Browser). It's presumably trying to clarify things for confused users trying to figure out how to install Snowflake as a proxy or VPN application, when that's not how it works.

edit to add the direct quote (which seems pretty clear to me): "Unlike VPNs, you do not need to install a separate application to connect to a Snowflake proxy and bypass censorship. It is usually a circumvention feature embedded within existing apps."