SketchUp Training on remote island

I have set up a new architectural practice on this little island in the south Atlantic, and have taught myself SU from scratch for project presentation and documentation.

I am keen to offer training courses to both hobbyists and the staff of the government drawing office, who have indicated that they would be keen to use SU.

The internet service is close to pathetic here, with it being very expensive and also very slow. Is there a way to download one program and then allow others to install it, then obviously logging on to buy the licence.

Please advise.