Is Dataloader deprecated?
Where can I download DataLoader?
Setup > Data Management > Data Loader. If you can't see this, you might not have permission. Make sure you're logged in as a System Administrator.
Is there any replacement?
There are lots of third party software, as well as the first-party Open Source Data Loader.
I see it just fine. In both Classic and Lightning
You can also go directly to the repository. You can download older versions this way in case you have any issues with zulu.