Hello @bellagon, Welcome to the /e/users forum.
since the big outage last year, all builds previous to e-2.4.1 were lost,
only versions that are the key steps to OTA upgrade devices running official branch were rebuilded.
i collected those builds from /e/ users, and published them here : [LEGACY_BUILDS] collection for /e/ OS supported "legacy devices"
(even if unfortunately i lost the avN version, you can find the bvN one)
But official “a10” is definitly a two years outdated version, i think better is to use a current “a13”, “a14”, or “a15” unofficial version from @Colors