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License error after downgrading OS, ST8


Hi there,


I have a problem with my academic code after degrading my OS from win 10 to win 8.1. 

I upgraded my OS from win 8.1 to win 10 a few days ago. After this upgrading, my Solidedge (ST8) became really awful: you can feel the cursor getting stuck every second you draw.  


So I downgraded my OS back to win 8.1 yesterday but when I applied the same academic code at the licensing dialog it just poped out the academic code is invalid. I even tried the 32 bit version ST6 and used the code provided at the very end of the welcome email but turned out the same porblem. 


Can anyone help?