Hello Stefan,
You need to select at least the "SAP GUI for Windows 7.30 (compilation 2)" in your frontend package.
Total disk space usage = 415 MB
All sub nodes will then then selected also. You can expand and eventually untick some of the nodes (SEM, CRM ?...) but the disk space gain will be negligible really.
Kind regards,
Eric Van de Catsije
SCN NW Clients Moderator