CHECK SHA256 with windows 7

Hello,

Could you help me to check sha256

I used Windows 7
I've downloaded et installed GNUPG

And after download https://images.offensive-security.co...-nexmon.img.xz

After, I would like to check the image but I can't

I open cmd (terminal)

gpg --keyserver hkp://keys.gnupg.net --recv-key 7D8D0BF6
gpg --fingerprint 7D8D0BF6

after, I must be have SHA256SUMS and SHA256SUMS.gpg but I haven't and if I download
http://cdimage.kali.org/kali-2018.1/SHA256SUMS.gpg
and
http://cdimage.kali.org/kali-2018.1/SHA256SUMS

and if I opened its, I just see

ed88466834ceeba65f426235ec191fb3580f71d50364ac5131 daec1bf976b317 kali-linux-2018.1-amd64.iso
b541a78a063b6385365ac00248631c4a18c92b8c4e3618db0b 1bf751b495149f kali-linux-2018.1-i386.iso
022b6cd87b016cafcccd06063f42555424afbe975d7d31c550 6a8dd527c24b53 kali-linux-e17-2018.1-amd64.iso
afecacef3ee75b5ef93c6ac4bf645f0c8b0212db22aa61e687 c49157e6a170cc kali-linux-kde-2018.1-amd64.iso
e47646078a5f31a952e9b5243a292d61bf6fc7af0d325f996c 1fb45e0f721286 kali-linux-light-2018.1-amd64.iso
5bf5ac2b1bfa969527c5125c404049400f9df0c44dbeb5ed71 6135f040ef95dc kali-linux-light-2018.1-i386.iso
f517a2947ffbab251bcf1066adb696249441b175c7150f45df 12757d0f36d155 kali-linux-lxde-2018.1-amd64.iso
ce446ec46170163781587bfccb2f14ae094a038e462d33bdf3 fc10660716befb kali-linux-mate-2018.1-amd64.iso
4d2b843bdf34957adda3dc5a399edf15db493be99f8361065f b8d3449c23220a kali-linux-xfce-2018.1-amd64.iso
6a73c549f41c2489205916d5f5a61ea56b6b7257738ffd0d1f 4410c1547bb0b3 kali-linux-light-2018.1-armel.img.xz
9bff3fa25a5f5149dbdd0c955f76d391c030ce1e3696a9166b cdc2b6a9fba061 kali-linux-light-2018.1-armhf.img.xz

not

1ce9fb1ab69c709046b3ddddfeff6481b484f19e8b2b61725c ebfb6361953c08 kali-linux-2018.1-rpi3-nexmon.img.xz

so impossible for me to check my archive.

Could you help me and explain step to step

Sorry for my english
I'm beginner