Sorry none of our themes are in active development right now.
And are not built or tested for Ubuntu distributions above 16.04 LTS.
They may NOT work on distributions released after 2016.
GTK Themes (16.04 LTS, Mint 18 And Bellow Only):
Any theme listed as legacy is NOT Supported anymore.
Legacy themes can still be downloaded and used on supported systems. (Ubuntu 16.04 LTS, Mint 18 and older.)
Please do not contact us reporting issues or things not working for the legacy themes listed.
But feel free to continue development yourself... Under a new name please.