It may happen that certain virus scanners have automatically deleted the .dll file. In this case, please repeat the installation of Redshift 9 again as suggested in the error message. Uninstall the program first; then you can repeat the installation from the DVD / download. Any activation that has already taken place is not affected by this; it will remain intact even if you reinstall.
If the error message is still displayed, please download the latest version of the Microsoft Visual C Runtime library and install it on your computer.
For Windows 11 (all versions) and for Windows 10 (64-bit versions) you can find it at: https://aka.ms/vs/17/release/vc_redist.x64.exe.
For Windows 10 (32 bit versions) at: https://aka.ms/vs/17/release/vc_redist.x86.exe