Please help. i want to move my file from Unreal 4.6 to 4.5

I accidentally downloaded wrong unreal version. My friend use 4.5 but I use 4.6. Is there any way to revert to older unreal?

Is there a reason you’re using a 5 year old (or thereabout) engine version?

While you cannot revert, you can download another version and have more than one installed: