You might want to file a CASE on this -
To create a technical or issue case at Cypress -
“Create a Support Case”
You have to be registered on Cypress web site first.
Can you let us know what is the reason for which you had to downgrade from PSOC Creator 3.0 to PSoC Creaotor 2.1 ?
Note that if you are using any pre-compiled libraries as dependency libraries then you might face issues. Because Creator 3.0 onwards Keil compiler version is Keil-951 and previous versions it was Keil-903.