how can you enable bloom in version 4.5.3 LTS?
If you want bloom in Blender 4.5.3 LTS, the simplest approach is to use the Compositor: enable Use Nodes, add a Glare node set to Bloom, and tweak Threshold, Size, and Intensity until it looks right, making sure your materials have strong emission; I’ve done this myself, and starting with a bright emissive object makes all the difference for a noticeable effect.