The setting can be found under Privacy Options and, depending on the version of Microsoft Word you use, looks exactly or something like this:
Some TariffShark users have reported that after unchecking the "Warn before printing..." privacy option, it appears checked the next time they go into Microsoft Word. It turns out that this option can be established by software policy, thus disabling users' ability to change it.
For some users, we have found that a registry entry can be used to uncheck the "Warn before printing..." box.
For Microsoft Word 2010, create or update the REG_DWORD entry named fWarnRevisions_1125_1 setting it to 0 (meaning unchecked) which can be found under registry key HKCU\Software\Policies\Microsoft\Office\14.0\word\options\vpref.
For Microsoft Word 2013, create or update the REG_DWORD entry named fWarnRevisions_1125_1 to 0 (meaning unchecked) which can be found under registry key HKCU\Software\Policies\Microsoft\Office\15.0\word\options.
If you need assistance applying this fix or are interested in more details, contact TariffShark Support.