A clear source image can look blurry when a design app displays a low-quality preview or enlarges it beyond its available detail. Diagnose the source and layout separately.
Open the downloaded file
Inspect it in a normal image viewer at its native dimensions. If it is already blurred there, check whether a larger genuine variant is available. If it looks clear, the design app's display or scaling may explain the difference.
Review the placement size
Compare the source dimensions with the area it fills in the design. A small crop stretched across a large canvas has fewer pixels available for each detail. Replace it with a better source or reduce the required enlargement.
Inspect a test export
Some applications use simplified editing previews. Export a small test and open the result before changing every setting. Keep the original file intact, and avoid repeated sharpening passes that create halos without restoring the missing information.