How to upgrade from 8.5.9 to 8.5.12?

Hello,
Today I wanted to upgrade my CMS from version 8.5.9 to 8.5.12. But the dashboard only offers 9.1.3. That’s no option for me since my theme does not so support it. So I downloaded 8.5.12 und moved the concrete folder of the zip file to

updates/concrete-cms-8.5.12/concrete

as always, but the dashboard still does not offer me to update to 8.5.12. So far this always worked.

Can someone tell me what I am doing wrong?

Thanks Harald

Servus Harald,
bie mir heißt es nach hochladen des komplett entpackten Packetes
updates/concrete-cms-8.5.12
Gruß Klaus