AcumaticaERPInstall constantly throwing log errors (26.100.0175)

Even after rebooting my machine, every single time that I try to create a new instance of 26R1, I get these errors and the installer stops:

Even if I press OK, I get more log errors:

If I press ignore, I just get more of these errors about the other log files that the installer created.

Question: how to get past these log errors so I can create a new instance?

Here’s the full error:

Cant't create the site 26R1
 --------------------------------------
 Inner Exception:
 Exception occurred while deploying the site files.
  --------------------------------------
  Inner Exception:
  Exception occurred while backing up the files from 'C:\deployment\sites\26R1\' directory. Try to do it manually.
   --------------------------------------
   Inner Exception:
   
   WARNING: The process cannot access the file because it is being used by another process.
   C:\deployment\sites\26R1\Logs\log_prepare_2026-04-09_11-11-53.txt
   
   
   WARNING: The process cannot access the file because it is being used by another process.
   C:\deployment\sites\26R1\Logs\log_process_2026-04-09_11-11-53.txt
   
   
   WARNING: The process cannot access the file because it is being used by another process.
   C:\deployment\sites\26R1\Logs\oem_2026-04-09_11-11-53.txt