Our online installer, a small size setup file is downloaded and when the setup starts, the actual files required for installation are downloaded during installation. So every time you install or even re-install software, files will be downloaded from internet.
Datacosa's offline installer (or a standalone), all the provided packages are downloaded at once. Data size might be considerably big size. After installation you can use Datacosa without even connecting to the Internet.
You will be directed a website by clicking the provided button.