Tried to search the web, the site, couldn't find it.
I understand. Unfortunately we no longer maintain a repository with 5.1.x binaries. Compiling from source would be the only option.
You can try searching here and compiling from source: https://github.com/percona/percona-server/tags?after=clone-5.5.35-build. There are still 5.1 builds available.
We no longer support version 5.1. Here is our software lifecycle policy: https://www.percona.com/services/policies/percona-software-support-lifecycle
I am aware it isn't supported, or that the source code is available - I was just checking if there is a binary distribution still available (maybe in some archive), that could save me the trouble of compiling it from source.
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