While technically possible through legacy installers or Windows wrappers, running FL Studio on Yosemite is not recommended for professional work. The system is likely to be unstable and incompatible with modern music production tools.
Furthermore, there is a security consideration. Yosemite is no longer supported by Apple with security patches. Running a production machine on an unsupported OS creates vulnerabilities. For professional producers, this is a significant risk; for hobbyists using legacy hardware that cannot be upgraded, it is a necessary compromise. fl studio mac os x yosemite download