Register * You must register for access to some support pages  FAQ Search   Support Main Menu  Entry #510: Is PPA 6.6.09 compatible with MCP 21 SSR 63.0? Question Is PPA 6.6.09 compatible with MCP 21 SSR 63.0? Answer Yes, the 6.6.09 version�of the Power Agent for MCP systems�is compatible with MCP 21 SSR 63.0.�