I’m glad you approached the forum for advice.
The old Daedalus wallets are 12 seed words, have a good look around for them. Hopefully it should be somewhere, when creating a wallet for the first time it requires the user to record the seed words and enter them back into the wallet to prove this was done, prior to the wallet being accessed.
Yes the version you have does not work anymore, you are required to update to access your funds.
Now, firstly do not uninstall your version of Daedalus, your funds will be lost if you can’t find your seed words.
There are a few options I would try, you can either download the Daedalus Flight version on your same PC, then try seed words if you find them. If they work you can update your daedalus. Flight version of Daedalus is where IOG send releases for public testing prior to Daedalus release.
You could get Yoroi, create a Shelley era wallet, as you will need to create one to stake. Then go to the claim / transfer section in yoroi to enter your seed words to transfer your funds to that wallet.
If you can’t find your seed words, unfortunately for now you are not able to access your funds. It is very important to keep your seed words safe. However, not all is lost… at some point (no date known) there will be an import feature on daedalus where you can restore a wallet from a previous version of Daedalus, as long as the info is still on your computer. That’s why you shouldn’t delete your current Daedalus.
Hope this helps with some options and even better if you find your 12 seed words.
I’m not sure what 25 seed words are for;
Ledger Hardware wallet - 24 or 27 seed words
Daedalus Byron era - 12
Daedalus shelley era - 24
Yoroi - 15
I’m not sure what Trezor hardware wallet is