Ok, we got it. In case somebody has problems with offline use of VSCode too here some hints:
- Use the command line to install all extensions (
code --install-extension <ext-file-name>) - The only setting to set is the path-to-python.exe within the Python-Extension-Settings. RobotCode uses this setting, no need to change other settings.
- In case of problems uninstall VSCode and delete both (!) %
USERPROFILE%.vscode and %APPDATA%\Code before re-installing VSCode (detailed explanation here)
We had a some problems probably because we tried the offline extension installation from within VSCode first, after cleaning and re-installing it was fine.