You can install it via ADB in TWRP if you’re comfortable with that.
Another option would be to copy the update to an USB OTG device (for example an USB Stick with the USB-A to Micro-B adaptor that’s included in the S7 OEM package) or a SD card and manually install it from there via TWRP.
This manual will be a great help: [HOWTO] Update /e/