New Computer - Error in updating patch from 1.21b to 1.31.1

[Wrda]

I'm not sure if this the appropriate place, but certainly is about the patch.
Just today I've installed my new computer and basically installed everything I needed. When I was about to update the patch by clicking on battle.net it came instantly with an error, an odd one: There was an error writing to your hard drive while trying to download a file from battle.net. You may need to free some space. Please check your hard drive and try again.

Notes: This new PC is a desktop Windows 10, SSD, intel core i7 8th generation, 8GB ram, 222GB hard drive memory.
And I still have 3/4 free space.

Does any one have any idea what this issue is about?

 

[deepstrasz]

Just download the installer from Battle.net.

 

[Wrda]

Ok, just did it.
Apparently it didn't even migrate data to documents folder, not sure if that's normal, or if it will cause problems.
I also don't have those 2 black borders on the side, despite being on 1.31.1. And I have window fullscreen enabled, it's the same thing if I change to the other options.

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