Hello! I download the software today - but when I try to open the wallet it comes
wallet: default_wallet ( no changes possible)
and Password - but I have never used before Electrum!
So you are you seeing a screen like this?
Are you not able to click the "Choose..." button and/or edit the "default_wallet" text?
If you can't, it sounds like a fake wallet. Do as the others suggested and check where you downloaded from.
If you can click "Choose..." and/or edit the "default_wallet" text, then you HAVE used Electrum before, and the application is simply attempting to open the old wallet (wallet files are not deleted if you delete/uninstall Electrum as it stores wallet files in your "user data" folder, not in the program directory.