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Found a repetitive error-partial solution to vcl270.bpl, Access Violations, etc. The projects that I have running in older versions works fine until I compile them with 10.4. They are most 32 bits. If I change settings to build 64 bits target, most of the errors disappear. Donn't know why I have to buil 64 bits as mandatory with Sydney for working compiled/run functional projects that works fine with previos versions of Delphi.
Co-lateral issue, some components I use do not have 64 bits version, so that is a problem for migrating to 10.4.
In addition some customers are still using 32 bits Windows versions, so I have to stay using Rio or older Delphi versions to compile .- deploy to them upgrades.