I cannot read the language but I guess it means that he cannot find the program scp. As I wrote already:
The commands are different if you use Windows. I don't use Windows here. spc is a Linux command line tool. pspc.exe is the same for windows. So you have to use pspc.exe. It has to be downloaded before.
Beside that you have added things after root@192.168.1.1:/tmp ... This is wrong!
If you have both pscp.exe and openwrt-19.07.4-ramips-mt7621-ubnt-erx-sfp-squashfs-sysupgrade.bin within you C:\Program Files\Putty you can upload your file with:
You have installed OpenWrt already (but not fully). The tftp part is for broken installation required.
2nd part is to finish installation of OpenWrt. No need for tftp. You could still use tftp to finish installation ... But that is more complex then proceed with that we have already.
That means the OpenWrt installation you have booted is corrupt or sth. else is wrong with your ethernet connection.
Yes try another computer if it is getting an IP automatically. Make sure your PC is connected into port 2 of the router NOT port 1 (the first one from the left)!