Until the beginning of October, my broker was FXCM (UK). Afterward, I switched to FXCM (EU) (using the FXCM plugin).
Now I have to switch again, as their client base has been sold to AvaTrade and TradeNation.

I am now trying my luck with a different broker that offers the MetaTrader platform.
I have opened a demo account and installed the Zorro plugin according to the manual.
Screenshot

Did I overlook something?

https://zorro-project.com/manual/en/mt4plugin

"Access denied" means your PC won't let you access this file. Either you have no access right, or more likely, it was locked by Windows. The simplest way to unlock a locked file is closing all programs and restarting the PC. If you have no access right, make sure to be logged in as a user with all access rights to that folder.

Thanks for the quick reply.
I already checked the access permissions yesterday.
I have full access there.

There are no permissions assigned to the "mt4sock038537xxxx.sys" file ?
Windows says "something needs to be done"

I created a text file there for comparison—see the screenshots.

"No answer is also an answer."

I tried the following: I created a copy of "xxx.sys" in the "temp" folder and deleted the original. Naturally, the "xxx.sys" file now has all the necessary permissions (SYSTEM, Administrator/Gery).
I doubted from the start whether this would even help. I’m still getting the same error message: "Access denied" to the "xxx.sys" file.

To be clear: I am not the programmer behind the DLL or "Zorro.exe," nor am I a system administrator who assigns permissions! I am just an ordinary user.
So, who exactly is responsible for assigning the permissions for "xxx.sys"?
As you surely know, other applications also use this "temp" folder. Does the regular user have to personally ensure that the correct access rights are in place?

Consider this:
The DLL has access rights to the 'temp' directory—otherwise, a 'xxx.sys' file wouldn't be there in the first place. The DLL creates an 'xx.sys' file but is then unable to read it—isn't that strange??

I would appreciate a response.

Scrennshot, permissions after copie xxx.sys and permissions "temp"

I share your doubt that copying a file in a temp directory will help with a denied access. Only copy files when you have a reason.

You can find suggestions in the manual for file access issues. If you can't fix it, you can hire our installation service for that. But normally, this should not be necessary for just restarting the PC and deleting an offending file.

Locked files are a problem that any Windows user can occasionally encounter, for several reasons. That's why the manual mentions it. It is unrelated to Zorro or MT4.