For Windows, just download the installation package from the above link. Launch it and follow the easy installation wizard to install it. It should take less than 1 minute to get the program installed.
For Linux, download the installation package and follow this instruction after the download.
For MAC, download the installation package and follow this instruction after the download.
Yes, your Worksnaps Client needs an account to log onto the system. You can obtain an account by registering or being invited by another user into a project (in which case you will receive an invitation email).
On Windows, after the installation of the Worksnaps Client, you will see it in your Programs menu. Just select and click on the program and Worksnaps Client will be launched.
On Linux, execute the command "run.sh" under the "bin" directory.
On MAC, you will see Worksnaps Client in your Applications folder, just click to launch it.