Before you may install Sales & Marketing web version you need to install the server to set up/upgrade the database.
Make sure to download the latest release from http://devnet.superoffice.com/Technical/Resource/?clubId=2&catId=87 (requires login), from CRM 7 there is only one installer for both 32- and 64-bits installation.
A SuperOffice CRM 7 database must be available, to install see here
Before starting the CRM.Web installer, make sure that the database user has access to the contents in the SuperOffice database through Netserver. This is done in SoAdmin by adding the user as an active system user.
NetServer Web Services may be installed separately to use with Customer Service and Pocket CRM.