Error decrypting after upgrading gpg (Windows)

Hi, After upgrading from 1.2.2. to 2.0.30 we have problems decrypting files from our partner C:\Temp\GnuPGtemp>gpg --version gpg (GnuPG) 2.0.30 (Gpg4win 2.3.3) libgcrypt 1.6.6 Copyright (C) 2015 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later

Cannot decrypt with 1.4.21 but with 1.2.2

I work in an organization where we sometimes receive and send encrypted files. This is far from our core business and we are no experts on this, so please bear with me. For managing the files, we use scripts calling gpg.exe. This is a Windows environment. We have been running version 1.2.2 for