Help with Eidoo wallet

My dad passed and while going through his things I found the seed for an Eidoo wallet. I have nothing but the seed. I tired downloading the app on an old Android device but it throws a json error when I try to recover the wallet. You can go to https://eidoo-wallet.io/ and restore the wallet through the web but that seems unsecure to me. I do not have much experience with crypto but knew my dad was interested/buying Ethereum. Does anyone have experience with using https://eidoo-wallet.io/ ?