Download Directory with SSE-C using TransferManager AWS S3

Question

I have a directory in a bucket on S3, which contains multiple file , previously I use to download whole directory using TransferManager like this

MultipleFileDownload myDownload = TransferManager.downloadDirectory(
                bucketName,
                storagePath,
                new File(downloadDirectoryPath));

but now I need to download this using SSE-C since they are encrypted .

After my research I have come to know that I can only download a single file using SSE-C but not whole Directory in v1 of AWS SDK.

Is there any workaround to do this?

Or should I download every single file within that directory ( which doesn't seem to me an efficient solution to me)?

Thanks in advance!