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I have some experience with OpenStudio 2.9.0 and use a PAT.exe file located in my directory C:\openstudio-2.9.0\pat\ParametricAnalysisTool.exe. I would try to backwards convert your OSM model files to OpenStudio 3.0.0, since you mentioned you were able to connect to AWS using PAT 3.0.0. Backwards conversion of osm seed model files seems easier than trying to connect to AWS cloud service using PAT 3.2.X.

For the version of your openstudio model, are you referring to your seed model (Model To Base Inputs On)?

Build Existing Model Measure with EmptySeedModel.osm

Normally, algorithmic mode produces an osm model file "automatically". Measures are applied to an osm seed model according to the PAT workflow (OpenStudio, EnergyPlus, and/or Reporting Measures, in correct order) to produce the modified osm(s) representing a design option or range of design options. These measure-modified osm(s) are then pushed to the cloud and run using EnergyPlus.

When you download your results, at least for PAT 2.9.0, these measure-modified osm(s) should appear in an output directory. A data_point.zip file is produced for each design option (osm) modeled, and the measure-modified osm for that data_point is in the respective data_point.zip file.

In practice, I have only ever specified one osm seed model used as "Model To Base Inputs On" for all my PAT measures.