Ну у них там же описано как другую версию залить
You may submit an update to your product's downloadable files by following these steps:
1 On the
My Products page, open the product you wish to update
2 Scroll down to the Product Files section and click SUBMIT FILE UPDATE
3 Make one or more of the following changes on the Submit File Update page:
◦ Create a new Project Version (to upload files for a new version of your project)
◦ Change the Project File Link of a pre-existing Project Version (to replace the files for Engine Versions your product already supports)
◦ Change the Distribution Method (from Asset Pack to Complete Project or vice versa, if your product is not a Code Plugin)
4 Click SUBMIT
5
Once a new build has been generated for your product's downloadable files, Epic will complete the File Update to distribute the new build accordingly and notify you.