Can I install an ipa file that are not certificated download from website on ios in device farm?

Hi.

You can't do that with an undistributed IPA made by someone else.

However, even if you are not registered in the Apple Developer Program, you can install a self-signed IPA by creating a zip package using the following method.

https://dev.classmethod.jp/articles/apple-develope-program-without-ipa-device-farm/