The conversion process from 32-bit GemStone/S to GemStone/S 64 Bit includes version checking; this does not include checking for version 6.7, so conversion from GS/S 6.7 to GemStone/S 64 Bit versions earlier than 2.4.7 will error.
The conversion target 2.x version should be 2.4.7 or later.
Last updated: 12/11/15