Selecting the target unity version for package publishing on the asset store

Right now, if I publish my package using the latest version of Unity, people who want to download/purchase my package are required to be using this version too. Since my package is compatible with much older versions of Unity and given the number of people out there that aren’t running the latest Unity version, I would like to be able to set the minimum required Unity version myself.

How can I do this without resorting to publish from an older version of Unity?

You can not do it. The package is bound to the version you export it from as the assets etc are in relation to that and especially their settings and what you can set.

youc an only import things in newer versions than the package was not the other way round.

easiest thing to do is install an older version in parallel and export from there