If you are maintaining an ancient project that was built with v20.0 and you lost the installer, write to BCGSoft support. Provide proof of your original license (order ID, company email). They are often helpful in providing a download link for the exact version you licensed.
If you are looking for "BCGControlBar 20.0 source download" via Google, you likely ran into the same walls I did: bcgcontrolbar 20.0 source download
Why are developers specifically looking for the source code of version 20.0, rather than just the compiled libraries (DLLs/LIBs)? If you are maintaining an ancient project that
If your company purchased BCGControlBar with an active maintenance plan before 2016-2017 (when v20.0 was current), you might have had access to the source. Check your original purchase records. BCGSoft provides a customer portal for downloading previously licensed versions. If you are looking for "BCGControlBar 20