A hoisting system for the installation or the maintenance of a wind turbine, comprising: measures to achieve a load bearing connection to an installed part of the wind turbine tower and comprises measures to move the hoisting system up and down along said already installed part of the wind turbine tower, wherein the hoisting system is arranged to install or remove any of a tower segment (31, 32, 56, 71), a nacelle (3, 122, 252), a generator, a hub (5, 253), and a blade (6, 254) in one or more combined hoists or in a single hoist, wherein the wind turbine comprises a tower, the hoisting system further comprising: a column (10, 138, 190, 210), a boom (14, 136), a winch and a rail, wherein the column is arranged for creating a load bearing connection to a part of the tower using one or more fixation points (7, 19, 20, 34, 36, 49, 40, 62, 74, 90, 92, 99, 107, 139, 160, 184, 185, 186, 230), wherein the fixation points are in particular successively located along a longitudinal direction of the tower, and wherein the column is arranged to move the hoisting system essentially in vertical direction along said part of the tower when the load bearing connection is created, wherein the column is arranged for creating the load bearing connection further using the rail (9, 137, 191, 198, 204, 213) enabling the hoisting system to be guided along the load bearing connection using the one or more fixation points, wherein the tower comprises the one or more fixation points wherein the column is arranged for moving the hoisting system in essentially vertical direction along the tower, by using a climbing actuator of said hoisting system, characterized in that the rail is fixed to the column, and in that the climbing actuator includes a connection actuator (97, 98), wherein the connection actuator (97, 98) is arranged to move one end of the climbing actuator in a direction from or to the column. measures to achieve a load bearing connection to an installed part of the wind turbine tower and comprises measures to move the hoisting system up and down along said already installed part of the wind turbine tower, wherein the hoisting system is arranged to install or remove any of a tower segment (31, 32, 56, 71), a nacelle (3, 122, 252), a generator, a hub (5, 253), and a blade (6, 254) in one or more combined hoists or in a single hoist, wherein the wind turbine comprises a tower, the hoisting system further comprising: a column (10, 138, 190, 210), a boom (14, 136), a winch and a rail, wherein the column is arranged for creating a load bearing connection to a part of the tower using one or more fixation points (7, 19, 20, 34, 36, 49, 40, 62, 74, 90, 92, 99, 107, 139, 160, 184, 185, 186, 230), wherein the fixation points are in particular successively located along a longitudinal direction of the tower, and wherein the column is arranged to move the hoisting system essentially in vertical direction along said part of the tower when the load bearing connection is created, wherein the column is arranged for creating the load bearing connection further using the rail (9, 137, 191, 198, 204, 213) enabling the hoisting system to be guided along the load bearing connection using the one or more fixation points, wherein the tower comprises the one or more fixation points wherein the column is arranged for moving the hoisting system in essentially vertical direction along the tower, by using a climbing actuator of said hoisting system, characterized in that the rail is fixed to the column, and in that the climbing actuator includes a connection actuator (97, 98), wherein the connection actuator (97, 98) is arranged to move one end of the climbing actuator in a direction from or to the column. a column (10, 138, 190, 210), a boom (14, 136), a winch and a rail, wherein the column is arranged for creating a load bearing connection to a part of the tower using one or more fixation points (7, 19, 20, 34, 36, 49, 40, 62, 74, 90, 92, 99, 107, 139, 160, 184, 185, 186, 230), wherein the fixation points are in particular successively located along a longitudinal direction of the tower, and wherein the column is arranged to move the hoisting system essentially in vertical direction along said part of the tower when the load bearing connection is created, wherein the column is arranged for creating the load bearing connection further using the rail (9, 137, 191, 198, 204, 213) enabling the hoisting system to be guided along the load bearing connection using the one or more fixation points, wherein the tower comprises the one or more fixation points wherein the column is arranged for moving the hoisting system in essentially vertical direction along the tower, by using a climbing actuator of said hoisting system, characterized in that the rail is fixed to the column, and in that the climbing actuator includes a connection actuator (97, 98), wherein the connection actuator (97, 98) is arranged to move one end of the climbing actuator in a direction from or to the column.