I have the same problem here. Really annoying, as I don't have a fast internet connection and have to wait a half minute for download to finish on each startup.
Using Spine 3.4.02 Pro and Windows 10 x64 education (always using the latest Windows insider preview build).
Why is the log showing that I use a x86 version, although I have x64, which is prooven by the 16GB RAM I have to use?
Spine Launcher 3.4.04
Windows 10 Education x86 6.2
Java 1.7.0_80 Esoteric Software
32-bit Server VM
Download required. (2560)
Downloading: Spine 3.4.02
Update complete.
Spine 3.4.02 Professional, LWJGL
...
Intel
Intel(R) HD Graphics 530
4.4.0 - Build 21.20.16.4482
Started.