In-app purchase is not supported

Core Shell premium is outdate, I try to renew and shows

Hi Robin, a reinstallation should fix the problem, please follow steps in this post:

And you can backup folders if you worry about data losing:

~/Library/Containers/io.coressh.shell/Data/Library/Application\ Support/io.coressh.shell
~/Library/Group\ Containers/E78WKS7W4U.io.coressh.ssh/

OK, thanks.