not use in any way) any threat signatures that use new/unknown syntax which has been added to later engine versions to avoid bugs and false positives (since the older builds would not know how to properly interpret them and therefore the behavior would be unpredictable if it tried to use a new type of syntax/signature that it did not recognize/wasn't coded for).
Unfortunately I don't know what the last version to support SP2 was, however the older a version is, the worse protection and detection capabilities it will provide so I really wouldn't advise relying on it to protect your devices or even to detect most modern threats and/or PUPs as the vast majority of signatures currently in use, including those which are included in the databases/signatures that would be downloaded by any older build like 2.x etc., would be exclusively version 3.x compatible as the scan and protection engines have been designed to disregard/skip (i.e. I'm guessing there's some form of proprietary hardware and/or software being used with the machine that requires a specific OS and service pack level which prohibits installing any major updates/making any significant changes (such as installing SP3).
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