try netinstal if its a must that you install that package

try netinstal

try download latest winbox from mikrotik website and use it if you are sure the router boot fully,
otherwise make sure the router is reset before lauching the winbox
Goodluck

why not try MIKROTIK 20Km Single mode, 1.25Gb SFP Module (S-31DLC20D)

though i have used modules from another vendor on 260gsp and it worked properly.
best wishes

make ether1 your WAN interface
put an IP address on wlan1, make it do DHCP
use the wizard to set up hotspot on your wlan