The FX3 SDK installer can be found for v1.3.4 and you can also use it to build a project using 1.3.3 library once installed.
The FX3 SDK v1.3.4 installer can be found from the link: https://www.cypress.com/documentation/software-and-drivers/ez-usb-fx3-software-development-kit
Once installed, please import your project and do the following:
1.) Right click on the Project -> Properties -> C/C++ Build --> Build Variables
2.) In Build Variables, click on FX3SDKVERSION -> Edit.. -> change value from 1_3_4 to 1_3_3 -> OK -> Apply => OK
This will change the build environment to SDK v1.3.3 and build the firmware image file.
Let me know if you face any issues.