frehu,
Thank you for working with CodeMix. Sorry that you are seeing this problem
I could install the Abap Snippets extension using the .vsix file you sent.
1. Can you please let us know what is the status of the CodeMix engine (bottom left you will see an icon besides ‘CodeMix’, hover over to see the status) when you are trying to install the extension using .vsix? Does it say the engine is connected?
2. Please share with us the workspace log file by clicking on the icon for Export Log in the Error Log view and send the file to us to help us look for any errors or exceptions.
Apologies for inconvenience caused.
–Swapna
Genuitec Support