Maybe it was added to the wiki later, but now it explains further down the page that you need the same flash utility as the one that is used to flash the L-tech XT-CF card. That utility wiki (which contains the download link for the utility) is linked to from the wiki page.
As for the correct BIOS, at the bottom of the page that you linked to, under the section "Downloads", you can see a link named "Alpha BIOS binary".
I had no problems downloading the linked ZIP file.
But here are the direct links to both the flash utility and the BIOS, just in case:
* https://www.lo-tech.co.uk/downloads/XT-IDE/lo … ash-utility.zip
* https://www.lo-tech.co.uk/downloads/isa-usb/i … imental-rom.zip
I also took the liberty of uploading both ZIP files to VirusTotal to have them scanned for any malware, even though they came from the original site. None was found. 😉
Good luck! 😀