This download is distributed as a ZIP archive (paint.net.5.0.13.install.anycpu.web.zip, paint.net.5.0.13.install.arm64.zip, paint.net.5.0.13 (5.13.8830.42291).install.anycpu.web.zip and paint.net.5.0.13 (5.13.8830.42291).install.arm64.zip) and requires decompression with a competent program.