Method for installing a pipeline on the seabed from a marine pipelaying vessel, said method comprising pipelaying and abandonment of said pipeline, wherein use is made of a marine pipelaying vessel comprising: - a pipeline launch tower, - a pipeline diverter which is supported at an elevated position on the tower, - one or more tensioners (15, 16) supported by the tower below the pipeline diverter, - an A & R system for abandonment and recovery of a pipeline, said A&R system comprising: - an A&R winch and A&R cable, - an A&R cable suspension sheave, - a hang-off clamp, wherein the pipelaying comprises: - lowering the pipeline along a firing line into the sea by means of the one or more tensioners (15,16) supported by the tower, said one or more tensioners engaging on the pipeline as so to support the weight of the seagoing pipeline, characterized in that the abandonment of the pipeline comprises: - halting the pipelaying and engaging the hang-off clamp with the pipeline at a position below the one or more tensioners (15,16) supported by the tower, - transferring the weight of the seagoing pipeline onto the hang-off clamp and holding the seagoing pipeline in the firing line by means of the hang-off clamp, - severing (101, 102) the pipeline between the hang-off clamp and the one or more tensioners (15, 16), preferably between the hang-off clamp and a lowermost tensioner, - connecting an auxiliary tensioning device (40, 41, 42; 120,121,122) to the lower end of the pipeline held by the one or more tensioners (15, 16), - transferring pipeline tension from the one or more tensioners (15, 16) onto the auxiliary tensioning device, - releasing the one or more tensioners (15, 16) from the pipeline, so that a section of the pipeline is held in the firing line between the pipeline diverter and the auxiliary tensioning device (40, 41, 42; 120,121,122), - vacating the firing line by at least displacing both the pipeline diverter and the auxiliary tensioning device (40, 41, 42; 120,121,122) and thereby displacing said section of the pipeline from the firing line, - arranging the A&R cable in the firing line vacated by said section of the pipeline, - connecting the A&R cable to the upper end of the seagoing pipeline held by the hang-off clamp in the firing line, - transferring the weight of the seagoing pipeline from the hang-off clamp onto the A&R cable, - releasing the hang-off clamp from the seagoing pipeline, - operating the A&R winch and thereby lowering the seagoing pipeline onto the seabed. - a pipeline launch tower, - a pipeline diverter which is supported at an elevated position on the tower, - one or more tensioners (15, 16) supported by the tower below the pipeline diverter, - an A & R system for abandonment and recovery of a pipeline, said A&R system comprising: - an A&R winch and A&R cable, - an A&R cable suspension sheave, - an A&R winch and A&R cable, - an A&R cable suspension sheave, - a hang-off clamp, - lowering the pipeline along a firing line into the sea by means of the one or more tensioners (15,16) supported by the tower, said one or more tensioners engaging on the pipeline as so to support the weight of the seagoing pipeline, - halting the pipelaying and engaging the hang-off clamp with the pipeline at a position below the one or more tensioners (15,16) supported by the tower, - transferring the weight of the seagoing pipeline onto the hang-off clamp and holding the seagoing pipeline in the firing line by means of the hang-off clamp, - severing (101, 102) the pipeline between the hang-off clamp and the one or more tensioners (15, 16), preferably between the hang-off clamp and a lowermost tensioner, - connecting an auxiliary tensioning device (40, 41, 42; 120,121,122) to the lower end of the pipeline held by the one or more tensioners (15, 16), - transferring pipeline tension from the one or more tensioners (15, 16) onto the auxiliary tensioning device, - releasing the one or more tensioners (15, 16) from the pipeline, so that a section of the pipeline is held in the firing line between the pipeline diverter and the auxiliary tensioning device (40, 41, 42; 120,121,122), - vacating the firing line by at least displacing both the pipeline diverter and the auxiliary tensioning device (40, 41, 42; 120,121,122) and thereby displacing said section of the pipeline from the firing line, - arranging the A&R cable in the firing line vacated by said section of the pipeline, - connecting the A&R cable to the upper end of the seagoing pipeline held by the hang-off clamp in the firing line, - transferring the weight of the seagoing pipeline from the hang-off clamp onto the A&R cable, - releasing the hang-off clamp from the seagoing pipeline, - operating the A&R winch and thereby lowering the seagoing pipeline onto the seabed.