If you would like to use BC Calc® in offline mode, the first step is to set up an account for the online version. Go to www.bccalc.com and register.
Once you have logged in, hover the mouse over your user name and choose "Offline Mode".
From here you may download a zip folder including the installer and instructions in PDF format.
(Unblock the folder and unzip the folder.)
The second green button is to download your user data. This will be used during the offline install.
Let us know if you need assistance.