Disassemble spring-assisted sash window
The sash were set in place with the guides. To remove them you will need to remove the inside window stops to expose the edge of the track. You will also need to remove the fasteners that are in the track, one of which is visible in your picture at the bottom. There may only be that one fastener, but there should be another at the top, and depending on the whim of the fabricator, there may be more. Two are only ever needed on each side, top and bottom.