The Interlaken IP out-of-band flow control block is provided as two separate modules.
For Interlaken (2nd Generation) Intel® Stratix® 10 FPGA IP, module files are located in ip\altera\alt_interlaken_hp\ilk_oob folder under the Intel® Quartus® Prime Edition installation path.
For earlier version of the Interlaken IP, module files are located in ip\altera\alt_interlaken\alt_ntrlkn_oob folder under Intel® Quartus® Prime installation path.