Ci-multi-runner-9.* with CE-8.14.*

I have: GitLab Community Edition 8.14.5 6f43aa0 installed (and can not upgrade)

Can I use latest ci-gitlab-multi-runner (shell) 9.1.* with this Gitlab 8.14.* installation??

Hello, no, runner 9 uses API 4, so you have to stay with your old runners.