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It might just be that your antivirus is blocking the download after a few successful downloads. Happened to me too. Unfortunately, I don't know how to fully prevent it. You can try turning off your antivirus while downloading as a test to see if it works.

In any case, fortunately there is a fix to this. Whenever this error happens, go to C: (so your PC/Laptop) --> user (the username of your PC) --> user ---> AppData ---> Local. Once you're in "Local", delete the folders Mozilla, ms-playwright, and ms-playwright-go (it can be that only one or two of those folders are present, in that case just delete those folders that are there). 

Then, go back to jav-it, open Download.bat, enter in the JAV code. Jav-it will now display another error but then automatically re-download the folders that you have perviously deleted. Then, after the automatic re-download, just enter the JAV code you want to download one more time and it should fully work now.

However, sadly, this error will keep coming back every 5-6 downloads, at least that's how it was for me. But it is manageable. Just keep doing what I mentioned above and keep deleting and re-downloading the folders whenever the error happens. 

If you use any of the cookie extractor plugins for Chrome or Firefox that turn r18 cookies into a .txt file, make sure that

1.) You get the .txt file AFTER logging into r18, not before

and

2.) For Chrome specifically, the plugin I use will download it as r18.com_cookies.txt. You need to rename it to only cookies.txt or else it won't work.

Only the Patreon version supports DMM downloads, so you need to upgrade for that.

Info on how to find the Patreon is in the README.txt file that you downloaded along with Jav-it here from itch.io

Update: I might have figured out what caused my error earlier.
It occurs when
1.) I open a second "Download.bat" window before the first one has started to display a download progress bar. Essentially when I'm trying to start a second download before the first one even properly commenced.
and
2.) When I open too many downloads at the same time, I think my max was 8 and at the 9th Download.bat window the program just gave up on me and couldn't load the simulation engine any more.
Even though I don't know how to fix it, it's pretty easily avoidable, all in all.

Important info: I've been using the Download.bat and Catalog.bat commands (from this guide here: https://itch.io/t/1560831/guide-how-to-use-this-program-for-beginners) to just make it easier for me because I'm a total layman simply trying to download my movies before R18 closes.

My OS version is Windows 10 Home, 22H2, Build 19045.2311

So initially it worked fine, I could download AV from R18 via my Chrome browser, even multiple movies at the same time as well by opening new windows of Download.bat.

But I keep running into the issue pictured below. (Disclaimer: I typed "test" as the content ID but even if I type in an actual ID from a movie I bought I will get the same message, just so you know).

When I follow the filepath mentioned, I tried deleting the folders "ms-playwright", "ms-playwright-go". When I did that and tried using "Download.bat" again after deleting, it will automatically redownload ms-playwright again to that location mentioned in the filepath there in my image. (which looks like this, pictured below again).

As you can see, the download worked fine right after redownloading the Playwright builds. 

But after a bit, it will just give me that message again, and when I check then, playwright.cmd is suddenly gone from the ms-playwright-go folder. I tried copying playwright.cmd to another folder, and pasting it back to that AppData Local path where it belongs whenever I get that error, but that won't fix the issue, instead I now get this (once more see picture below).

Of course, I could delete the ms-playwright folders each time to force a redownload but I will just get the error again after a while. It also robs me of important time before R18 shuts down, since I can't parallel download e.g. 8 AV when I already get this Playwright error after the 2nd or 3rd download. The issue is clearly with ms-playwright, but I don't know why it keeps disappearing from the folder. Any ideas on how to fix this permanently?

I have looked through some other posts and someone recommended downloading and installing MS Visual C++ Redistributable, but it didn't fix the issue for me.