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In some cases the data folder may not be in the default location, for example, it may be on a network share so that it is always backed up.
If this is the case you can check the current path being used for the data folder, to do this you will need to open the Trustid.ini configuration file from the old PC which is located in the installation directory.
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If you open the ini file in notepad you will see an entry for DataDirectory which will show you the current path. If it is a network share then you can simply point the new installation to the same network share, otherwise you can copy the folder and change the path following the same steps above.
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