Step 1:
Move your replays to the new location, you should be able to do this on your own
The current location should look something like:
C:\Users\USERNAME\Documents\Heroes of the Storm\Accounts\414512322\2-Hero-1-7752163\Replays\Multiplayer
Step 2:
Delete the Multiplayer folder from the Replays folder.
Step 3:
Open up command prompt as administrator, this is done by opening the start menu, and typing in " cmd.exe " and rightclicking the only result showing up, and clicking Run as Administrator .
If more than 1 result show up, click the one with an icon that looks like a black box with the text C:\
Step 4:
Navigate to your replay directory with the cd command, easiest way to do this is to copy/paste the path from your explorer window.
The command should look something like this:
cd C:\Users\USERNAME\Documents\Heroes of the Storm\Accounts\414512322\2-Hero-1-7752163\Replays
Step 5:
Enter the command:
mklink /D Multiplayer "D:\Path\To\WhereYouWant\YourReplays"
for instance
mklink /D Multiplayer “D:\HoTS\Replays”
You should get a message looking similar to:
symbolic link created for Multiplayer <<===>> D:\HoTS\Replays
Now it’s done, no more replays on C:
I thought that this is useful information, so I dug it up from the old forum. The solution belongs to Moonlit. And you can see the original post here:
https://eu.battle.net/forums/en/heroes/topic/17615141645