LinPlug Spectral - Manual (Page 9)

The installation is always only for the current user; if you want to use the
plugin with different users on your computer, each user must run their own
installation (however, you can choose the same installation location).
Common to Mac and PC
To enter your personal Serial Number
you should go to the Options page the
first time Spectral is started (the button
to open the Options is in the lower right
of the User Interface).
Copy your personal Serial number from
the mail you got after your purchase
and paste it into the field labeled
"Serial Number". Some DAW may not
allow copy/paste operations to a plugin,
then you have to enter it manually.
If the serial number has not yet been
entered or it has been entered
incorrectly, Spectral will remain in
demo mode and emit a noise sound
about once a minute.
If the serial number has been entered correctly, it turns into the label “Valid”
If you have any questions regarding the installation or entering your serial
number please contact our support at:
http://www.linplug.com/technical_support.htm .