VSDC Pro Video Editor is one of the GOTDs. Kudos to the devs for Not including [forcing] yet another install of the C/C++ runtimes -- a major reason Windows\ WinSxS\ is often so Huge -- which IMHO most people already have [the required version is from 2015]. One of the comments however was from someone who didn't have the required file(s), followed by a [IMHO] maybe confusing thread of replies. I thought that my explanation, or at least the link I included *might* be useful to someone else in the future.
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"This program cant start because mfc140u.dll is missing from your computer."
Microsoft provides several versions of c/c++ runtimes, which basically are collections of code that can be reused or shared across very many apps created using Microsoft's programming tools. The idea is that those apps don't have to include that code, making them smaller and easier to code. Like .NET and Direct X, the latest versions are backwards compatible, *to an extent*, so depending on the software you're trying to run, installing older versions may not be necessary. The c/c++ runtimes are usually installed to the Windows\ WinSxS folder -- one reason it's likely the largest folder on your system -- and most people will probably find that they have several copies of most versions of the runtimes in that folder using search. That's why some companies don't include them in their software installs. Some app installs do put them in other Windows folders, e.g. System32, or the program's folder itself, because those are the places Windows knows to look when it's searching for a needed file or files. Note that many of the runtimes have security-related updates available, so it's a good idea to check Windows Update after installing, even if you installed the latest download you could find. Google "c c++ runtime" [w/out quotes] for a ton of download links etc. An all-in-one installer is also available -- handy for new Windows installs -- that adds the latest versions [as of May, 2021] of all the runtimes:
techpowerup[.]com/download/visual-c-redistributable-runtime-package-all-in-one/