Can you check for a file called "squidyavi.bat" inside c:\programdata (this is a hidden folder). If it exists, can you open it in notepad and paste the contents here? If it doesn't exist, try restarting AE, reopening your project, and manually clearing the render queue.
BTW, where did you buy the script from? I have never charged more than $5 for it, and you said you bought it yesterday but I don't see any transactions in the past 6 days.
Also, if you haven't yet, come join the High Quality Gifs discord where lots of people share help and advice. https://discord.gg/Yzcw7Q