Yes. If we make a small technical update then we upload it to the product file and this replaces the file in your download section. this is called a V0.1 update. If the update effects the look of the model then we call it a V1.0 update. This is added free to you download section so you have the option to download either. All models that are released begin at version 5.0 this is the first print tested release version.
A printer with a print volume of W100mm x D100mm x H100mm will be able to print everything. Our models can be printed on any 3D printer. We recommend you get a printer with at least a 150mm (6inch) print bed as its great for printing multiple items. The Prusa is is our main development printer.