ਜਨ 28, 2020 ਤੇ steva (Developer) ਵੱਲੋਂ · ਪਰਮਾਲਿੰਕ

Please have a look at the add-on's description. I explain there why it is not yet compatible with Thunderbird 68.

By the way, for questions/issues related to this theme, please use the support link next to the add-on description. Thank you