SQL Server Development Tools (SSDT) will always need to be installed on the machine(s) where you design your packages. It allows you to design and deploy SSIS packages using Visual Studio.
For SSIS+ releases prior to 2.0:
If you are using Data Flow Task Plus in your packages, you will need to install SQL Server Development Tools (SSDT) on the SQL Server where your packages are scheduled and executed. If you are not using Data Flow Task Plus, you will only need to install SQL Server Integration Services (SSIS) and the COZYROC SSIS+ Suite on the server where you schedule and execute packages; SSDT will not be needed.
For SSIS+ release 2.0 and later:
You will
not need to install SSDT on the SQL Server where your packages are scheduled and executed, even if you are using Data Flow Task Plus. You will only need to install
SQL Server Integration Services (SSIS) and the COZYROC SSIS+ Suite on the server where you schedule and execute packages.