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 the installer, user data and instructions in PDF format.
Unblock the install file before running as an administrator.
Let us know if you need assistance.