I got desperate, I tried all the instructions I could find on the Internet – nothing helps.
What I have:

• wallet.dat from bitcoin-core encrypted from 2015 (in four different
  places)
• the password I used to encrypt it (I remember that I had to click on
  the lock inside the application and enter the password)
• the same computer I did it on with windows os
• inside the file the hex editor shows different data (NOT FFFF)
• when trying to restore via pywallet with passphrase – ERROR:root:Couldn’t open
  wallet.dat/main. Try quitting Bitcoin and running this again.
• when trying to download with loadwallet CLI command in Bitcoin Core – Data is not in recognized format. (code -18)
• downloaded the old version of Bitcoin Core (12) – wallet.dat corrupt, salvage failed
• last transaction was at 2018

I need advice – what other options do I have, how can I try to decrypt this file and access it?

Thank you,
Best regards,
Roman