My wallet is stored on a thumb drive.  I just tried to open it.  It's been named default wallet since I got it several years ago.  When I opened it, the message said that file does not exist.  I closed out and started over.  The next time and every time since, when I open the folder, it says this folder is empty.  That folder contained all files for the wallet.  I downloaded another wallet 4.0.9 from electrum.org.  When I attempted to open it, it says that file does not exist.  How do I proceed to getting my wallet back?  I have seed and password.

When I try to send BTC from Electrum to pay for ETH in my Atomic Wallet, I get this error message:  BestEffortRequestFailed('no interface to do request on... gave up.'  I'm using the receive address for ETH in my Atomic Wallet.

you can set a custom fee as per this guide:

https://bitcoinelectrum.com/how-to-manually-set-transaction-fees/


when the fee is unusually high as a percentage of the amount you wish to send electrum warns you about it so you don't end up spending more on fees than you want to. this warning is what the OP is talking about.

Do you have a large number of inputs (small transaction towards your wallet)?
Also if you are not in a hurry, you may want to wait until the week-end with your transaction.

I could show you how to set the fee manually, but then you'll set it to 1 sat/vbyte and then you'll complain that the transaction is not confirmed.
I think that your best bet is to try in the week-end and then keep an eye on it. Also keep an eye onto https://mempool.space/ and see when the fees fall to 5-15 sat/vB (now they're at 105-256 sat/vB)

Fee are not calculated in percentage (%) but in size and weight (Satoshi/vbyte).

Also, know that if mempool is congested, the fee will be higher, and when mempool is not congested, the fee will be lower.

Just make use of the fee customization or wait until mempool is not congested. But, if you use too low fee, your transaction may not be confirmed in time.

OK?

Do you not want to pay 7% in fees? If not then you can move the slider that should appear to within 5 blocks (an hour) or 25 blocks (5 hours).

If you do but you're just wondering if it's an error, btcs price went up recently so your $100 may be less in btc terms if you've been holding a while.

Any luck here?

I'm having a similar issue... sent funds from my Bitcoin app (iphone) to a QR Code address that I have in Electrum... Transaction ID 96747021559f66479b8b7732ff9c6d4c3aff8422884a642a72a6207f934aa877

The funds havent been credited to my Electrum wallet and its been 18 hours. I've transferred this way a few times and its worked until now.

Also, sorry if my question is dumb, I'm very much a novice here.

Also getting "Error getting transaction from network: The server returned an error" message when I try to load the transaction from blockchain.

It the connection icon didn't even change, you might have improperly selected a server.
The right way is to right-click on your selected server then select "Use as server" from the right-click menu.

Yes. It could turn red briefly but should synchronize again and turn green.

Did you check whether you've downloaded from Electrum.org? Did you verify using ThomasV's PGP?

Click the bubble at the bottom right, uncheck connect to server automatically, right click on any other server and click use as server then click OK. Check if your bubble remains green and try again.

Did you try restarting electrum and then connecting to a different server if it didn't work just by restarting?

Why do you say you downloaded from electrum.org using the link in the wallet? What wallet did you update from?

Any luck? Did you figure out exactly what it was that was causing 3.3.8 to keep opening? Was it the icon pointing at the wrong executable?

Sounds like the 3.3.8 is a "portable" version or possibly the "Standalone" version of Electrum.

If you've already run the Windows Installer (several times by the sounds of it), then Electrum 4.0.9 should now be installed in "C:\Program Files (x86)\Electrum", so you can easily check and confirm if it is there.

When you right click the icon on the desktop that you're using to start Electrum, and select "properties", what is the "Target" that is displayed? It should say:
Like this:
https://i.imgur.com/9OjF0dn.png

If it says something else, what exactly does it say?

Let me ask if the Electrum 3.3.8 is a portable version?
If yes then the 4.0.9 is already in your system you must look for .exe file and make a shortcut on your desktop.

Or if the 3.3.8 is not portable you can uninstall it first before you install the latest version but before you install make sure that you have wallet file backup that you can find mostly on \Users\YourUserName\AppData\Roaming\Electrum (or %APPDATA%\Electrum). Once you have the backup wallet you can proceed to uninstall 3.3.8 then download the latest version to the original electrum website this is the original one https://electrum.org/#download be careful on fake Electrum websites.

After you install you can now import your wallet file to the same location (\Users\YourUserName\AppData\Roaming\Electrum) and then open your wallet or use seed backup if you have.

Then try to restart the PC/laptop again let's see if your the Electrum version still the same after reboot.

Does the link take you to electrum..org?

There is a malicious phishing message attached to old versions from a server which you may have been a victim to.