Downgrade unreal engine 5 project to 4.27 or 4.26

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1

Hello , I’m trying to downgrade my UE5 project to a older version 4.27 or 4.26.

i have done the following.

  1. go to Epic games launcher and clone the project
  2. go to the clone folder and select the project and right click and select ‘‘switch unreal engine version’’ I have done this in 4.26 and 4.27.
  3. the project is opening in the old versions but is missing the map, on the folder i can see the map but not in the editor.

4.i drag and drop the map in the editor but i had the following error ‘’ unknown extension umap’’

I am not sure why it does that , any help is appreciated

1 Like
2

Downgrading is not possible.

3

Did you finally work out? Same Situation here,help plz~ :sweat_smile:

4

The typical limitation of UE. They, at least, should allow the engine to ‘try’ to open it; things without internal changes should work really fine! Only those with new functionalities could not work, but that should be OUR problem, not being automatically fully locked, without the freedom to make the try… I already suggested it, but it seems nobody cares.

4 Likes
5

you can downgrading the procjet just click in .uproject and “switch unreal version”

2 Likes
6

The button only works upwards. :smiley:

7

Yeah since they changed the physics engine i don’t think you can revert back versions only convert in place to a higher version, if converting in place certain blueprints may not function like the previous version so you may have to fix them in particular circumstances, others will convert fine simple props or environments convert fine but anything with physics like motion to cars or other animations may break during conversion, best thing you can do is always keep an old version separate as backup in case you need to revert, but no you can’t start a project in 5 then go backwards in versions with the same project.

9

Sucks that you can’t downgrade. I mean, makes sense with Nanite not being supported… but considering the fact that V-Ray only works in 4.27 it just… sucks. Does anyone know of a vray work around for 5.1?

10

I made a plugin (https://www.unrealengine.com/marketplace/en-US/product/asset-downgrader) that downgrades assets to 4.27, with certain limitations (for now). Let me know if it works for you. If not, contact me and I can do more research/fix it.

2 Likes
11

Actually, you can downgrade yes,
See that button?: (1º)
Click and it will appear something like this: (2º)
Click on the name, and change the version: (3º)

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Sem Título970×1160 148 KB

12

@Heroi1200
This is a misconception. Once an .uasset is saved in a newer version of the engine (like 5.4) it can’t be opened in an older version. There is a “package version” check which for 5.4 is ~1012. If the package version is newer than the currently opened UE version, the asset won’t open. My Asset Downgrader | Fab is the only way to downgrade assets.

13

A helpful post and very nicely illustrated; however, you may have misunderstood the original poster’s question. They asked about downgrading UE projects, not UE iteself. (If they’re looking to downgrade a project, they presumably already know how to install older UE versions side-by-side.)

14

do you have some tutorial more simple step by step it looks way too complicated on youtube?

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(post deleted by author)

16

I’m curious as to why you think it’s complicated. You literally select the assets you want downgraded in the custom engine editor and click downgrade.

17

my smart a** put it in directory instead Plugin folder that is why I was confused… but 5.5.3 downgrade it crash unreal whatever version is selected, it start and then crash

18

There’s a lot of reasons for crashes, including new bugs. Why not send me an e-mail with the offending asset(s) ?

19

i accidentally press update from 5.5.0 to 5.5.3… then I know it was even worse than it was. Assets are mostly blueprints of interior, now I am making UV lightmaps in detail and I will start everything in 5.3, and copy blueprints so no need, thanks anyway :slight_smile: