Totem Congrats. Another solution would've been try the eopkg's rollback feature (eopkg history) and undo the update.
You can use Software Center on your installation media. Or eopkg search on terminal within Solus system.
If you mean completely without the OS handy, there's no user-friendly utility/site for that, but you can browse the repo here: https://packages.getsol.us/shannon/
Make sure the packages you download are not delta packages as those are meant for incremental updates. Also remember that mixing and matching package versions is discouraged and you should always use the latest versions so your system doesn't break.