You likely have a corrupted or wrong version. Delete that DLL, empty your recycle bin, and follow Method 1 (reinstall) or Method 3 (extract from original installer).
The only safe source is from an official Steinberg Cubase 5 installation (original DVD or legal download from your Steinberg account). The DLL is installed automatically. download synsoacc.dll cubase 5
If the file is missing or corrupted on your system: You likely have a corrupted or wrong version
Since this file belongs to the licensing system, updating or reinstalling the license control software is the most effective fix. The only safe source is from an official
A quick Google search will reveal hundreds of websites offering "free DLL downloads." We strongly advise against downloading synsoacc.dll from these third-party sites.
A quick Google search for "download synsoacc.dll cubase 5" leads to countless sites like dll-files.com, fix4dll.com, or dlldownloads.net. We strongly advise against using these sites for several reasons:
Instead of manually downloading a single file, you should repair or reinstall the official source.