Issue with latest update

I'm not sure I follow what you're saying. From my own testing, I do not see any issue with unlocking the various game functionality when researching technologies that do so. Make sure to validate your files with Steam and see if this still happens in a brand new game.

Manually kicked off the update to make sure no files were missing and started a new game (shame, because that first one was going really well otherwise) and still seeing functionality missing.  Same issues as before.

Could you please provide a save file show casing your issue. You can post it over on discord in gc4-commons with a small explanation of your issue. We'll be able to load it on our end and better understand what you're seeing.

For example when you says, "any access to the ability the topic covered" and "you never get the button that allows you to do the task", what exactly do you mean ?

I mean that I do the required research, then the button never shows under Executive Orders.  The other buttons appear (Draft Colonists, etc.) but not that one.  I'm not on Discord, so I don't know how to send a save file, but I am seeing other posts on this forum with the same issue.

Yeah I gotcha now. I actually made a mod,  BugFix_UP_Voyagers, found in the Bundle of Mods at https://www.galciv4.com/mods/manager that fixes this issue. So while we wait for a fix to the base game, it's an option for your next game while playing a civ that uses the Voyager Trait or is affected by this issue. It'll only work on a new game though; same as if it makes it into a patch actually.