Win 10 vs. Mac installer 2 issues

I install to both PC and Mac.

The downloads take considerably longer on the PC than the Mac. And I’m talking downloading on one machine at a time (not simultaneous).

Also on Windows when I chose a new download (i.e. just bought new expansion packs on sale) the download page wants to re-download things that are already installed.

Anyone else experience these issues? Any resolutions to be had?