homeassistant-data that is not a folder just a tekst.
You can download form github everything to compare the folders like it should be
should be something like this zip
swiss-army-knife-card-master
everthing in this folder you need it also in you system
swiss-army-knife-card-master\ha-config
I did a manual install so I dont know what addidng the SAK manual in HACS did with creating the folders.
But first step is this to check or create like I have it below
These folders you need to have in config dir.
and the yaml files in the config
.
├─ lovelace/
├─ themes/
├─ www/
│
├─ configuration.yaml
├─ ui-lovelace.yaml
└─ sak-examples-dashboard.yaml
after that you can go to step 1 and step 1c for comple and check the installation.
If things are unclear leave a note to @AmoebeLabs