No, you do not have to do an uninstall. Acronis typically emails to you, on the spot, the serial number and everything you need to keep all the setting that you have set with the trial. You can load a released version on top of the trial or previous version, and all settings and configuration information will be maintained.
A. Normally the serial number for your uBR900 cable modem should be marked with a sticker on the back or bottom of the unit. The serial number is normally an 11-character string that usually starts with the letters FAA.
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If you are unable to find the serial number marked on the outside of the uBR900 cable modem then you will need to log into the uBR900 cable modem and issue the show version command. The processor board ID as reported by the command is the serial number of the unit. 2ff7e9595c