The block Sweden Forecast stopped working a time ago. Did not get any updates.
Today I did some research. In the file loadForecastSE.php I located the path to the data,
$dataURL = "http://opendata-download-metfcst.smhi.s ... /data.json";
It seems that SMHI have done an update, the folder /pmp2g/ in the path has changed to /pmp3g/
Here is source path http://opendata-download-metfcst.smhi.se/
I did change it in my installation and it seems to work now.
I have not done any deeper testing, but maybe this little change was enough.
All best
/Christian