iTunes update locations on Win 10
It seems that iOS update via iTunes requires three different locations on Windows 10. For the last two, I solved it with mklink shortcut to another drive.
Itunes download folder
1. In the iTunes app on your PC, choose Edit > Preferences, then click Advanced. 2. Click Change, then select a new location for your files.
How to change iTunes Download Drive
I am trying to download a software update to my iPhone via my computer and iTunes. ... How do I switch the Download folder/drive used by iTunes?
Change where iTunes files are stored on PC
Go to the iTunes app on your PC. Choose Edit > Preferences, click Advanced, click Change, then select a new location for your files . From now on, new songs and other items you import will be stored in the new location.