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Need curtain track installed

Hey guys, I have a very old, half-broken curtain track in a bedroom that I would like taken down and replaced with a new one. However, the curtain track when measured was roughly 3.5m, and it curves around the corner of the bedroom windows so it may make it very tricky, that, and the curtain track is hidden underneath part of the ceiling that hangs down? I have attached photos to try describe what I mean. Most curtain tracks I've looked at are only straight and do not curve, so any help is appreciated!