The device originally relied on the Digital Voice Editor (DVE) software. Sony discontinued the download service for DVE in March 2017, recommending a transition to Sound Organizer . How to Download and Install Sony ICD-P620 Drivers
The Sony ICD-P620 driver exists, but it is trapped inside 2005-era software. Use Windows XP/Vista natively, or switch the device to Mass Storage Mode. Avoid driver-updater scams, and always scan legacy downloads with Windows Defender.
Even if you find the original file, it was not coded to run on the Windows NT kernel architecture used by modern Windows. Users often report "Hash for file is not present in the specified catalog" errors or generic "Code 10" errors in Device Manager.