To make your life easier, I’ve submitted SyncML Viewer to the official Windows Package Manager Community Repository (winget). From now on you can get it by a simple command:
winget install SyncMLViewer

After a quick install you can use it:

You have to open a new shell as the path variable is updated, then type SyncMLViewer:

Hope this simplifies even more the access to the tool.
Happy monitoring, with the newly winget published SyncMLViewer.
If you want to have some info about the tool have a look at these posts as well: