It's free 🙂 And I think it works better then the built in solution. Looks like he actually calls it Magic Solo. This might be personal preference, but I like it better since it is really simple - select your object/objects and hit the plug in. You get your objects and associated materials solo'd until you hit the button again. Simple.
Search in the Assetbrowser for "subdivision". Drag that in the object manager. This is a deformer that does the same as SDS and has a selection string field. Create a polygon selection on the mesh you want to subdivide and drag it into the selection string. The result should be the name of the tag in quotes.
"problem: [R21] slow saving of .c4d file to network share"
This was improved in R26, network saving can be >10x faster due to the new file handling code. Users report that on for example a 10gb network, saving speeds are around 500 mbyte/sec