Hi Venkata,
As far as I know you cannot reconfigure script-server on Cloud-share SAP HANA trial system for predictive analysis.
Anyhow give it a try - for the same please refer to the following links:
PAL -- Getting Started | SAP HANA
PAL -- Key concepts | SAP HANA
PAL -- Multi-user considerations | SAP HANA
PAL: Authorizations | SAP HANA
PAL: Troubleshooting | SAP HANA
PAL: Using the new AFL_wrapper_eraser | SAP HANA
In case if nothing works out on Cloud-share SAP HANA trial system then I would recommend you to go for SAP HANA Developer edition, please refer to the following link:
Regards
Kumar 