On their official website, they state that they have the official style file for Zotero downloadable from their journal homepage. https://turkishneurosurgery.org.tr/static.php?id=7
Please use this link to download the style: https://turkishneurosurgery.org.tr/style/images/turkish-neurosurgery.csl
Then go to Preferences>Cite, there would an + button to select the style file in your downloads. Select it then add it to your styles, it will be available for use both in Zotero and word processors. I haven't tried it and this is all based on the journal's instructions.
Türkçe: Derginin kendi web sitesinin ana sayfasındaki Zotero ikonuna tıklayarak indireceğiniz dosyayı Zotero'da Düzenle>Tercihler>Atıf(programı Türkçe kullanmadığım için yanlış olabilir) menüsündeki artı + butonunu kullanarak Zotero'ya eklerseniz kullanabilirsiniz. Bunu kendim denemediğim için kesin konuşamam ama eğer çalışmazsa buraya tekrar yazın lütfen.

Right click on the link, "save as...". It will download the .csl file that you can then install in Zotero via double click or via the menu.

I would suggest that this journal hosts their style on our style repository.
This has several advantages:
- Allows the community to fix issues
- Is a central point for distribution
- Will show within Zotero when searching for the style
- ....