Start at the Finder. Click on the Go menu.
From the Go menu, locate and click on Computer.
This brings up the finder showing your Macintosh HD. This is your main hard drive. Click the triangle to reveal and contents of the HD.
Locate the Library folder and click the triangle to reveal its contents.
Locate the ColorSync folder and click the triangle to reveal its contents.
Inside the ColorSync folder you will find a folder labeled Profiles. Double click it to open a folder window.
Below is the Profile folder opened in a finder window. You should see a variety of profiles already here. They are files that end in .ICC or .ICM. They will have the colorful icon you see below.
Leaving this window open, locate the file you downloaded from our profile library. Copy and paste the profile from there to the Profiles folder as seen above.
Single click a file. That will highlight it as seen below.
Next, go to the Edit menu and select Copy as seen below.
Copy - An Alternative Method
Control+click or right click the file you want to copy. The right-click menu will appear. Choose the copy function as seen below.
Go back to the still open Profiles folder. With the finder window highlighted, go to the Edit menu and choose Paste Item. That will paste the profile into the profiles folder.
You may see the dialog below. This is the admin authentication. Just enter your admin password to complete the paste process.