PLEASE DO NOT FOLLOW THIS
The path Ronny has mentioned is just single update and not complete. So if you do that, you won’t have any previous updates. We do not recommend doing that.
Regarding update speed, users who have installed CIS3.9, are expected to get ~35MB update and therefore update may sound slow in nature and also progress shown in update dialog is not real time as it stays till 5-30% for quite some time while it actually downloads in background.
Although we have boosted backend servers to make sure users don’t see slowness.
Thanks
-umesh