AFAIK LW used to offer partial downlds for those installing/upgrading but there were often errors such as those with connection issues for one reason or another. Whilst I appreciate your reasons, I hope it has been maximised so the chances of errors are minimal & the backup mechanism to the full downld does work as hoped. Sorry if I sound pessimistic but I am aware of issues people have had in the past & hope that this system counters well for those with such issues. There always seems to be at least some few who have connection issues due to whatever reason such as packet loss, inconsistent connection quality, comp. shared time issues, etc. (Sorry if this seems loud but just being concerned for the general windows user.) At least the LW installers are much smaller than what they were in earlier version!
Plus ... people should install Java offline compared to the present system. And installed before LW.