Missing " Alara Reborn" "ARB" Set even after latest masterb

Sry my 1st post is a question, but i am missing the "ARB" Set and i do not know if to or how to add it manually.
Thx for help in advance
Thx for help in advance
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https://www.slightlymagic.net/forum/viewtopic.php?f=38&t=2683