Hi Voiding,
Please find below inline answer of your queries. Please revert in case any query.
1) 1)In the SAP Market Place, in the download section, I clicked on "By Entry Group" but I don't know wich files I have to download.
· Ans:-
No , You cannot download it manually. Please login to Solution Manager and run maitanance Optimizer (MOPZ) which will automatically download rtelated EHP6 support packages from SAP Marketplace for you.
2) 2)Do I have to install SAP Netweaver to Update the ECC to EHP6??
· Ans:-
No, SUM Tool will automatically install Netwevaer 7.31
3) 3) Does anybody know (besides Google) where can I find a guide about the installation?
· Ans:-
Please refer upgrade guide at https://service.sap.com/erp-ehp.
Regards,
Shashanka