You cannot use LR 5 trail and enter a LR 4 serial number. That is what you asked. You should download the LR 4.4.1 update as linked, above, and enter your LR 4 serial number.
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You cannot use LR 5 trail and enter a LR 4 serial number. That is what you asked. You should download the LR 4.4.1 update as linked, above, and enter your LR 4 serial number.