Now it looks even worse.
Also, some of the snap core modules seem to be corrupted.
The update process seems to be very fragile on your system.
Can you delete the folder ‘C:\Users\THH\AppData\Roaming\SNAP’?
Afterwards, you should have a clean SNAP 8 installation without updates.
Try to open the images now.
If this works update, SNAP again.
You could also download the modules manually from
Index of /updatecenter/8.0 (esa.int)
The important folders are ‘snap’ and ‘snap-toolboxes’.
There are tools which can help you to download the files.
Afterwards you can install the downloaded files in the plugin-manager.
Before doing this. You could try if the update via the command line is more reliable for you.
Update SNAP from the command line - SNAP - Confluence (atlassian.net)