The VirtualBox Guest Additions installer will be updated to include a minimal payload of the VC++ 2019 Redistributable (both x86 and x64).
I noticed a significant decrease in 'guru meditation' errors and unexpected guest OS freezes after ensuring my C++ libraries were up to date. c++ 2019 redistributable virtualbox
If you have the redistributable but VirtualBox still complains: The VirtualBox Guest Additions installer will be updated
Here is a review of why this specific combo is essential for a stable setup: Rating: ⭐⭐⭐⭐⭐ c++ 2019 redistributable virtualbox
If you cancel the redistributable installation or it fails, the VirtualBox installation will also fail or be incomplete.