I just downloaded Unreal engine for the first time and it is on Version 4.25. There is a content pack that i want to use but it is made for only 4.24 and below. Is there a place where i can download or just go back to the 4.24 version of Unreal Engine? Just a side note i am very new to Unreal, so if you can please try to keep it simple. Thanks in advance! 
If it’s an asset pack, you check show all projects, select your project. At the bottom, there should be an option to choose your engine version, marked in red.
Select the previous one and that should work.
Almost any non BP pack should work no matter the engine version.