Hi Alekhya,
Why are you using Http to download the file? if you don’t need to content, just provide a link to it.
<a [src]='propertyFromControllerHoldingLink' target="blank">Download {{FileName}}</a>
Should do most of the work for you. If that’s not possible, you can convert your file to a dataUri, and then do the above with the resulting uri.
Regards
Sander