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Numerical Cloud subscription is asking me to re-activate - why?

Typically you should just enter your activation code one time only.   There are a few possibilities that could cause a prompt to re-activate the license.

Roaming Folder:

The Numerical Cloud license is  typically located in the users Roaming  folder, "C:\Users\<Your User  Name>\AppData\Roaming\NumericalCloud".   If you switch users (on the same computer) or the "Roaming Folder" is deleted or changed could be a reason for the re-activation prompt.  You can verify/change where the Numerical Cloud license is stored by going to menu:  Setup | Options..., select tab "Misc", and see "Numerical Cloud Folder".

Proxy server:

A “proxy server” is typically used to block access to the Internet by Local Area Network (LAN) users unless they are authenticated with a user name and password. If our software resides behind a proxy server then Internet access will also be blocked for the license activation system. 

Invalid Password (avoid using punctuation marks and symbols such as @, &, and *, for example) :

For your activation Password please keep it simple and only use characters:     0-9, a-z, A-Z    (avoid using punctuation marks and symbols such as @, &, and *, for example). 

Other possibilities: 

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