Solution : https://service.sap.com/sap/support/notes/620884 (SAP Service marketplace login required)
Key words : 
0 sp01 internet sales e-selling reason, solution upgrade guide mysap crm4, symptom upgrading crm internet sales, terms crm-isa upgrade, existing crm internet sales 3, /crm-inst -> sap crm 4, sap note 620711general information, 1 tocrm internet sales 4, crm product catalogs, crm transaction comm_pcat_ims_init
Related Notes : 
       
| 634869 | SAPKU40001: Support Package 01 for CRM 4.0 | 
| 633813 | Incorrect mimes URL | 
| 555414 | ISA upgrade 30 to 31 or 40: Shop Maintenance |