For me it works better in Windows 10 than in 7. The problem is more on my end with variables like using an outdated browser, background processes using resources or traffic on a VPN that interrupts the download or conversion process on my Win 7 machine. If I switch to another browser that uses the extension to start a failed download over again it wants to start where I left off in the first browser, that happens to me in Win 7 if it weren't for that I'd give it 5 stars.
Update: It quit working. It went through the process of (step one) downloading but quit there and didn't go through the conversion process and give me the finished file. The only thing showing downloaded was an empty mp4 file.