Hi there. For the first case, it is very likely that Windows Defender, or your own AV software removed it since many packages (for some reason) think Microsoft Playwright, or Firefox are malicious programs. Specifically because they are downloaded automatically for the user (outside of Microsoft update or some other approved mechanism). As for the second case, this program is a command-line tool and requires some basic command-line knowledge. If you don't have the prerequisite skill, you can use the helper batch files others users have created. However, there should be plenty of examples (Search the forums) on how to run this via command-line as it is pretty simple/straight forward. Additionally, the Patreon version will soon include a user interface which will make this easier for beginners to get going.
That's something you'd have to decide on your own to be honest. Our Patreon Discord community does have a bunch of guides and tutorials on how to use the program. However, I am unsure if you would consider that kind of instruction useful enough for you, or if you would be willing to seek help from live users on Discord (of which we generally have many).