Theme reinstall= “Installation failed: -1”

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Hi, I have the same problem as https://wordpress.org/support/topic/deletion-failed-the-requested-theme-does-not-exist/#post-9181806 trying to reinstall Longevity.

I installed it, decided I needed a child theme after I’d made some customizations so deleted the theme in order to start fresh.

However when I tried to Add Theme again (from depository) I get “Installation failed: -1” and the theme shows with update failed button.

So I tried to delete the theme showing and it gives the Deletion Failed message the same as the OP in the link above.

I checked via FireFTP and there is no Longevity theme installed.

Any help appreciated.