You cant, neither on Z77 or with that adapter.
What users need when the motherboard doesn’t support BIF, its an adapter with a BIF chip on it, due to the lack of it in the motherboard model.
The Z77 cant be mod, only X79 and higher.
Of course… it will not cost 15€… it costs way more, search on web for those or get a X79 or higher.
An example of those linked here: [REQUEST] Gigabyte Z97-HD3 Rev.2.0 NVME boot support custom bios please - BIOS/UEFI Modding / BIOS Modding Requests - Win-Raid Forum (level1techs.com)
And here is a very persistent user, back in 2021, with all his efforts and debate on a Gigabyte Z77:
PCIe bifurcation/ delinking - GA-Z77m-d3h - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)