I've used Sony Vegas and Movie Studio for my own use since they were first available from Sonic Foundry. IMO, has a more straightforward workflow than Adobe Premiere, which is what our edit suite uses at work. I believe you can still download a fully functioning 30-day trial at
Movie Studio 13 Suite. You can also try any of their other versions including Vegas Pro. Though note that Magix recently purchased Sony Creative software. BTW, you can generally find the best prices on Sony Movie Studio on Amazon.com, or during specials on NewEgg.com. But try, before you buy.
Though I also have Avid Media Composer, I don't recommend it if you have limited experience using editors. It tends to require a higher learning curve, licensing can be expensive, and has specific hardware requirements (workstation/server class). It's what most movies, network shows/news are edited.
There is also another powerful video editor available completely free BlackMagic Design
DaVinci Resolve 12.5. It's actually a "Hollywood" class color corrector, with a powerful video editor included. Basically, ignore the color correcting part, MP4 format is not recommended as a source color correction format, and use the video editor. Though will have a higher learning curve. So again, not really recommended if you're not familiar with video editors.
DaVinci Resolve 12.5 should install on most PC/Mac systems, though does have some higher hardware requirements, so not all features may be available. None likely to effect MP4 editing anyway. It also supports a single on-board GPU hardware processing, so higher end video graphics, will likely see better performance. It also does install a server, though I believe this is related to file handling.
I have Resolve 12.5 installed on a beefed up dual-monitor Mac core i7 in my work cubicle, and it apparently didn't have all the currently recommended hardware requirements. Though, again, doesn't effect most any video editing. And it's free, so might as well try it?