Solution : https://service.sap.com/sap/support/notes/667435 (SAP Service marketplace login required)
Key words :
'add sca/swc/sda, server-side file browser, server side file browser, <sdm_home>/inbox directory, minimum version required, latest sdm version, remote gui reason, sdm remote gui, sdm server, remote gui
Related Notes :
| 667438 | SDM 620: Corrections in patch level 13 |
| 532892 | Installing a new version of the Software Delivery Manager |