Can no longer mount hard disk

One of my external hard disks is a 8 TB "Seagate Backup Plus". It is formatted with NTFS and came with a driver program and utility (named "NTFS for Mac"). This worked well until I updated my Mac from MacOS 11 to MacOS 15. Now when I try to mount the drive, it says "failed to mount". The drive is also not visible at all in DiskUtility, but is visible from the "NTFS for Mac" utility. The error report says Process: FSApp Path: /Applications/NTFS for Mac.app/Contents/MacOS/FSApp Identifier: com.paragon-software.ntfs.fsapp Version: 15.5.90 (15.5.90) Code Type: X86-64 (Native) Parent Process: launchd User ID: 501 Date/Time: 2025-01-08 09:12:29.6518 +0100 OS Version: macOS 15.1.1 (24B91) Report Version: 12 .... Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_GUARD (SIGKILL) Exception Codes: GUARD_TYPE_MACH_PORT Exception Codes: 0x00000000000003ea, 0x0000000000000000 Termination Reason: Namespace GUARD, Code 2305843022098596842 What could be the problem? What could I do to get the drive mounted?