The latest WoW patch this Tuesday could not install on my SSD and ran out of space.
I removed the screenshots, Interface, Logs and WTF folders and the WoW folder was still 158g.
The incicies folder was very large.
I compressed the C: drive freeing up 5 gig and still not enough space,
I uninstalled WoW via the Bnet app and renamed the remaining WoW folder.
After clicking the Install button and waiting an hour all was fine and works perfectly.
Except the WoW folder is now only 100g. The renamed folder is 100mb.
50g saving in the WoW folder is a lot of wasted space to prevent an upgrade.