How to get my old skill back

so, when i first started using mycroft (back in 2020) i developed couple of skills (did not publish them on github). Now i got back to mycroft and they still show in my skill list on my mycroft account, but i have no idea how to get them on my new mycroft instalation. I tried installing them by name, but that doesnt work, and of course i dont have the source code for them…

Is there a way to get them back on my new mycroft installation? The devices that they were originally installed on dont really exist anymore.