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Install Nonprofit Success Pack
If you are new to Salesforce and the Nonprofit Success Pack:
If you already have NPSP, and want to upgrade:For step-by-step upgrade instructions (complete with screenshots), use the Nonprofit Success Pack Upgrade Guide.
If you already have Salesforce, but don't have NPSP:You can install NPSP on any "empty" version of Salesforce Enterprise Edition. However, this process is only recommended for experienced Salesforce Admins. If at all possible, sign up for a new trial version of NPSP instead. (Instructions above.)
IMPORTANT : Make sure you consult these post-install instructions once you've completed your upgrade.
The Fine Print
The Nonprofit Success Pack is an open-source, BSD-licensed package. Developer contributions and involvement are welcomed and encouraged! Salesforce.org hosts all packages and source code on GitHub using git. You can find all code as well as tags, issues lists, and release notes in the code repository. You can find contributor instructions on the Salesforce.org GitHub wiki.