Our studio uses Unreal 4.26, but the only version of that instaLOD plugin available is for UE5. Even though new features/updates would no longer be included, are legacy download options available?
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You can simply reach out to support request a specific build of the integration. However, as you already pointed out, newer features would not be included.
As additional detail, it’s best to reach out to your account manager with the request.