As most of you know flash player has a built in killswitch to stop runing content after 12 january 2021.
There are a couple of ways of circumventing this.
1 the easiest one. change the date to something before 12 jan 2021. Your browser might display an error message but flash will run content including Eredan.
2 get a flash version without the killswitch, most of them are prior or during 2017 versions. Here is one plus a tutorial:
http://andkon.com/arcade/faq.phpYou might need a differen web browser to run it depending on your system.
3 Use a Virtual Machine with al old browser / flash player. Some old versions browsers like Chrome v 49 or prior have built in flash that doesn't have the killswitch, howerver they might not install on newer OS. However you can run them with a VM and an old OS.
4 To keep an eye on in developement Flash content players like Ruffle, wich might soon run Action Script 2 wich is needed for Eredan. I heard there are a few more and some for linux GNU's. If anyone knows more ples feel free to share.
5 although this works its a bit hard to control the game: you can play from an android device with the browsing app Flash Fox or something similar. From a PC you can also through an android Emulator, but in my opinion to much work for faulty gameplay. Is usuefull if you just want to log in to get a calendar bonus.