This download is distributed as a ZIP archive (paint.net.5.1.3.install.anycpu.web.zip, paint.net.5.1.3.install.arm64.zip, paint.net.5.1.3 (5.103.9170.35777).install.anycpu.web.zip and paint.net.5.1.3 (5.103.9170.35777).install.arm64.zip) and requires decompression with a competent program.