The first problem is that the pattern prints out too small. It is 6" with the seam allowances, and should be 6" without the seam allowances. So the first file is a pdf with the correct sizes.
The second problem is that the cutting directions are for the undersized block. The will work, but it is tight. So, Colour 1 - cut 1 - 6 1/2" square - Cut 4 - 4 3/4" squares, cut in half diagonally. Colour 2 - cut 4 - 3 1/4" squares. Background - Cut 4 - 3 1/2" squares - Cut 2 - 5 1/2" squares, cut diagonally twice.

fold on 1-2 and 3-4 and place on 1st fabric
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2nd piece lined up
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pdf file with correct sizes. Download to use.

pattern prints out wrong size.
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trim pattern leaving extra 1/4" all around.
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fold on each line.
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Folded
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I glue the first piece
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1st piece face down
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1st piece placed & glued
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Check 2nd piece.
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Pin & stitch (use short stitch) past line at least 1/4"
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ready to trim before adding piece 4
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put a pin through the outside corner to see it the piece is lined up right.
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gently pull back to release stitches to stitching line.
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fold back and trim
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Check piece 4
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