I managed to get viaplay plugin made by [member=hitolaus] working again. You're welcome to try it out:
http://github.com/JeppeTh/Viaplay.bundle
Note that password is shown in logs though - see ReadMe file. Also the range of Movies etc are limitied - it's the same range as for a browser in iPad Android devce without DRM support.
Now also available through the unofficial app store:
https://forums.plex.tv/topic/25523-unsupported-as-in-totally-unofficial-appstore/
Note that Plex Framework doesn't support subtitles for channels:
https://forums.plex.tv/topic/72902-requestchannel-for-subtitle-when-watching-a-video/
If there are any issues - please provide these - but don't forget to remove your user name and password from logs before submitting.
.../Plex Media Server/Logs/PMS Plugin Logs/com.plexapp.plugins.viaplay.log
.../Plex Media Server/Logs/PMS Plugin Logs/com.plexapp.system.log
There is a known issue about not possible to play via some clients/browsers due to crossdomain issue. It seems Viaplay doesn't support the request for a crossdomain.xml (replies with 404 not found) and some players seem to handle this as ok to play - and others (e.g. Chrome) doesn't seem to like this. I tried some different "Redirect" extensions to Chrome but without any luck. I.e. this isn't really related to the plugin.