I am on Windows, but I guess there is no big difference when updating Electrum on Mac. When you say : "log out from old account", you mean on Electrum wallet? There is no need to remove old wallet, just download new wallet file from link I posted above and follow the instructions :

• Download Electrum - Executable for OS X -
• Expand the downloaded .dmg. - For OSX on a Mac, find the downloaded .dmg file (e.g. a file named "electrum-3.3.4.dmg"), double click on the .dmg file to expand it into a Electrum executable file, drag the expanded Electrum software into 'Application' folder on your Mac and the installation is completed.
• Launch Electrum - Please note, for security concern, to launch an application you downloaded from the Internet for the first time, by default Mac would not let you open it by double-clicking. If you trust the source where you downloaded Electrum, in order to launch the Electrum wallet for the first time on your Mac, please locate it under 'Applications' folder, right-click on the application, select "open."

I find those instruction here, and if you only update old wallet use first 3 steps. If you want to create same wallet on other device, in step 4 choose the option "I already have a seed".

k1nx, it makes no sense to be paranoid in this case, your coins are completely safe with and without update to latest version. The only problem which you can have is that old versions of wallets can not be synced, which means you can not make an outgoing transaction, or see incoming transactions in your wallet.




It's completely safe to update to latest version of Electrum as long as you do it using files from the official site. If you use this link, there should be no problems : https://electrum.org/#download

Are you intending on use a copy of the same wallet on both computers (Not really recommended) or are you going to have two different wallets?

Either way, I don't see it really being a problem...

You definitely won't be able to connect until you upgrade to latest version... so you should definitely do that ASAP. You don't have to worry about losing your BTC if you have your 12 word seed mnemonic safely and securely written down.

If you don't have that seed... you should open Electrum, then goto "Wallet -> Seed"... and then write those 12 words down and put them somewhere safe! (NOTE: you don't need to update to be able to do this) DO NOT make a screenshot or email these words to yourself or store them in a text file on your computer... keep them OFFLINE!

Once you have your seed, update... download from here: https://electrum.org/#download and then check the digital signatures of the downloaded file!