Hi, I'm unable to install D2 on my brand new gaming laptop and I don't understand why. It says it requires 96.8 gb but i have 176 gb free on my SSD, yet I'm still getting the error. I've tried restarting my laptop, closing and re-opening my bnet launcher, and changing the location of the install, and nothing helps. I've checked the bnet forums as well, and I'm not the only one with this issue.
Try some of the solutions in this thread. It is more of a windows issue than a game issue https://forums.tomshardware.com/threads/not-enough-disk-space-message-on-drive-with-plenty-of-space.1065730/