Why the Application Help old version can not be available

Experts and SAP official

Why the Application Help old version can not be available

http://help.sap.com/saphelp_srm70/helpdata/en/

http://help.sap.com/saphelp_srm50/helpdata/en/37/4b4b3c99c53c33e10000000a11405a/frameset.htm

I think the old version is different and more detailed for some part.

How can I get it?

Thanks

Regards,

Hayashi