hi
yes, sap gui version no longer available. you can access either CRM Webdynpro UI using the tcode CRM_UI,you must have business role assigned to each user to access crm ui.
refer here
ShortCut to CRM WEB UI In Solution Manager 7.1
SOLMANPRO a must needed authorization in SAP Solution Manager 7.1 Incident / Change Management
and also you can try via Workcenter, assign needed workcenter auth to all.
Regards
Jansi