BleakholdDownloads
Every client patch, the folder it belongs in, and a checksum so you know it arrived intact.
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Checking a file
On Windows, open PowerShell in your download folder and run Get-FileHash .\Patch-R.MPQ. The result should match the SHA-256 shown above. If it doesn't, download the file again.
New to all this? The install guide walks through every step.