There can be many reasons for transformations of Office documents to fail, e.g. you might not have LibreOffice / OpenOffice installed (did you include it when running the installer?), or the source files might simply be too large (there are configured limits), or you are using some Microsoft specific features within the documents that LibreOffice7OpenOffice cannot handle.
Using the OOTBee Support Tools addon you can activate more detailed transformer debug logging and test out changes to the configuration at runtime. That would be helpful to pinpoint the cause of your problems...
