sql server 2012 express download link free

Link to download free SQL Server 2012 express is given below:

SQL Server 2012 express

It includes SQL Server Express LocalDB and a new lightweight deployment option.

sql server documentation free download pdf

Links to download sql server documentation:

SQL Server 2012:
Product Documentation for Microsoft SQL Server 2012

SQL Server 2008 r2:
Microsoft SQL Server 2008 Books Online

SQL Server 2008:
SQL Server 2008 R2 Books Online

Microsoft SQL Server Protocol Documentation in PDF

SQL Server 2005:
SQL Server 2005 Books Online

Note: Currently books online is not available as pdf download.

sql server 2008 r2 sp1 cu5

You can download Cumulative update package 5 for SQL Server 2008 R2 Service Pack 1 using the below link:

Cumulative update package 5 for SQL Server 2008 R2 Service Pack 1

sql server 2008 r2 cumulative update list given below:
Other Cumulative update packages download links for SQL Server 2008 R2 Service Pack 1:

Cumulative update package 6 for SQL Server 2008 R2 Service Pack 1

Cumulative update package 4 for SQL Server 2008 R2 Service Pack 1

Cumulative update package 3 for SQL Server 2008 R2 Service Pack 1

Cumulative update package 2 for SQL Server 2008 R2 Service Pack 1

Cumulative update package 1 for SQL Server 2008 R2 Service Pack 1