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2018.4.18 instead of 2018.10?

I got it a few days ago, have not personally noticed any difference between 2018.4.9 and 2018.4.18 and it has the same release notes at 2018.4.9. Like you, I was also disappointed not to get 2018.10.1 :(
Seems people have had trouble installing 4.9 (mine failed and they had to push another install update to me), so my guess is that 4.18 is just an updated version of 4.9 to ensure that install issues are fixed.