I guess it should be
"C:\Program Files (x86)\GnuWin32\bin\wget" --no-check-certificate https://system-image.ubports.com//pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz -O pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz && echo "a1a0e2e7d5e2e242b11e7a2fabbabeaaffa7b62fa8b0b014f25b92e0ed888437 pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz" | sha256sum -c
i.e. the --no-check-certificate is an option for wget, no sha256sum