One of the handles should have a set screw on it to remove the handle. May be allen screw. Remove the four screws and the handle with plate should come off. Then there may be screws inside holding the other side of the lock. Or there also may be four screws on it also to remove that side.
I have 2 inside cats who aren't declawed. And they are using the bathroom door frame to keep their paws sharp. The frame of my bathroom door looks terrible. Does a...
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Depending on the style of door handle you select, you'll need to follow the manufacturer's directions... but here's a post a wrote for you to refer to in general of how it's done: https://simpledecoratingtips.com/2017/09/27/change-a-door-lock/
One of the handles should have a set screw on it to remove the handle. May be allen screw. Remove the four screws and the handle with plate should come off. Then there may be screws inside holding the other side of the lock. Or there also may be four screws on it also to remove that side.