Question: Physics Updates" version "642 is  installed but is not active?

Today I Installed  Physics Updates" version "642 in Maple2020, why does it tell me  it has installed but is not active? How to active it?


`The "Physics Updates" version "642" is installed but is not active. The active version of Physics is within the library D:\\Program Files\\Maple 2020\\lib\\maple.mla, created 2020, March 5, 9:36 hours`

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