Viber back up and sync on windows 7

Question

I copied the folders of viber on 04-01-25 and have viber download folder coppy until today. New installation of viber gives me all the messages when I sync with my phone but no media files in viber download folder even after I copy them. The DB relation breaks. If I copy the DB file in viber folder gives me complete chat history with media files intact, but I loose 1 month of files and history that are important. I can't force sync the phone with PC to restore the missing month because viber does not support win 7 anymore. Suggestions of which tables in viber db to merge to fill the gap. Viber support does not want to give that info :) Thanks in advance

tried to merge chat history db file from phone sync that has the missing messages and media with the old DB file, but trows errors or keeps only one of the chat history logs depending on the donation and base DB