We have a need to install both the 32-bit and 64-bit Erwin r9.64.02 on the same machine. I know this is not possible out of the box, but there must be a way with some registry and path changes. The reason we need that is because we would like to use Excel macros and connectors to a model and our company is using 32 bit Excel which creates an incompatibility. Also, we like to use the 64-bit Erwin due to the much better RAM allocation/management that plays a role with the large models we have.
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