First register at sdn.sap.com
then download from here —> Download here
SAP NetWeaver Application Server: ABAP including Web Dynpro

Once the contents are extracted, initiate installation by clicking on start.bat to start the installation overview page. The download package contains a detailed installation guide and information about the evaluation developer license.

For trouble shooting click here

To use SAP Interactive Forms by Adobe, you must install the necessary credential file and activate it using a unique password. Download the latest credential and password from SDN.

here is the alternative direct link… not sure how long it will last.
SAPNW7.0ABAPTrialSP12.part1.rar
SAPNW7.0ABAPTrialSP12.part2.rar
The first and second file are required to install the complete trial software package. Place the files to the same folder and extract “SAPNW7.0ABAPTrialSP12.part1.rar” only.

SAP NetWeaver 7.0 ABAP Trial Version System Requirements:

Operating System: Windows XP Professional (Service Pack 2) or Windows Server 2003.
Hostname must not exceed 13 characters.
NTFS-File systems.
Internet Explorer 5.5 or higher or Firefox 1.0 or higher.
At least 1 GB RAM.
Intel Pentium III/1.1 GHz or higher (or compatible).
22 GB hard disk space temporary during installation - 10 GB permanent.
High-resolution monitor (1024×768 or higher, 256 colors).
Make sure that no other SAP system is installed on your computer.
The SAP system requires serveral ports for communication services. Therefore the file %WINDIR%\system32\drivers\etc\services must not include an entry for the ports 3200, 3600 and 8000. A possible entry can be excluded by using the hash symbol (#).
If no DHCP server is available on your network (which dynamically determines the IP address) or your computer is not connected to any network, you need to install the virtual interface adapter MS Loopback Adapter. The procedure to install a loopback adapter is documented within the download package.

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