If you update to 11.32, then you will not be able to roll back to the previous version 11.31 by using the X-Plane Installer app.
The only way around this is to save a complete copy of your 11.31 version file structure somewhere safe, before updating to 11.32. Then, if 11.32 is problematical, you can always completely delete the whole 11.32 file structure and replace it with the 11.31 version that you have stored somewhere safe.
In any event though, no matter which version you have installed, you will always be able to update to newer releases of X-Plane 11 as they become available from LR, assuming that you have a valid copy that originated from them and not Steam!
Hope this helps?