1. Is there a separate version of the MSP interface for 'Patch 1' ?
2. Any MSP interface (new driver) issues fixed in Patch 1 ?
1) Yes there is. It can be downloaded from the Software Downloads in PPM.
2) There were not any new driver fixes included in Patch 1, so you can keep using the MSP interface from the old non patched version (15.4.1 base). The ReadMe for Patch 1 can be found here: https://docops.ca.com/ca-ppm/15-4-1/en/ca-ppm-15-4-1-release-information/ca-ppm-15-4-1-1-and-jaspersoft-cumulative-patch-readme-files