calling someone simple is an insult. so stop calling your readers simple. it doesn't mean what you think it means.

what version of electrum are you using? electrum not electron cash. the version number is listed in the window title and can also be ascertained via the help menu > about.

Your trezor holds your private keys. The entire point of using a hardware wallet is that it keeps your private keys away from your computer.

In order to get your priv keys on to your computer you will have to restore from your trezor seed. Begin via file > new/restore. On the seed entry step click on options and check bip39. After that when you right click on addresses in the restored wallet the private key option will be there.

Create a new wallet using file > new/restore. When you asked whether you want a segwit or standard wallet choose standard.

find your wallet file and rename it to something else. then run electrum and restore your wallet from seed:

location of wallet file: http://docs.electrum.org/en/latest/faq.html#where-is-my-wallet-file-located

How to upgrade on tails: https://www.reddit.com/r/Electrum/comments/78p9dz/electrum_in_running_in_tails_os_does_not/dovztij/?utm_content=permalink&utm_medium=front&utm_source=reddit&utm_name=Electrum

the transaction won't show up on blockchain.info. it's a known issue with that site.

yes it is best to use a different address for every transaction:

https://bitcoinelectrum.com/frequently-asked-questions/#why-does-electrum-give-me-a-different-address-everytime

there is no benefit in doing that

Yes it'll go to the address you gave the sender but when you spend your bitcoin they will be moved around. Some of them will be sent to change addresses. Electrum manages all this for you so you shouldn't fixate on addresses too much. All the addresses in your wallet are yours. Ideally you use a different address for each transaction.

If you want to know more about change then see the following two articles:

https://en.bitcoin.it/wiki/Coin_analogy
https://en.bitcoin.it/Change

More info about addresses and how to receive bitcoin in electrum:

https://bitcoinelectrum.com/frequently-asked-questions/#why-does-electrum-give-me-a-different-address-everytime
https://bitcoinelectrum.com/how-to-use-the-electrum-receive-tab/

If it's a segwit wallet then the extended public key is a ypub or a Ypub. An xpub will create a standard non-segwit wallet. See the release notes for 3.0:

https://github.com/spesmilo/electrum/blob/master/RELEASE-NOTES

no there is no limit. you can try until the sun goes supernova

Use the installer version for 2.9.3 not any of the others.

Regarding support for electrum it is open source software so support is by the community. This forum, the #electrum irc channel on freenode and the /r/electrum sub-reddit are the main places where you can get support. The electrum developers do not have access to your wallet seed or private keys so they can't help you recover access to your bitcoins. Those secrets remain on your hard drive encrypted by the wallet password.

Also to add to what HCP said in the past we've heard about malware that creates electrum wallets on people's computers in the hope that they send bitcoin to those wallets. So if you didn't create the wallet in the past it could have been created by some malware program.

You don't need an anti-virus on a mac. Very few malware programs are aimed at mac and linux users so no point running an anti-virus.

Yes you can generate many addresses from the MPK using scripts. If you tell me what programming language you prefer I can recommend a suitable solution.

You can ask in #electrum on freenode. The devs tend to gather there.

Another option is to keep your eye on these sites:

https://tradeblock.com/bitcoin/

https://btc.com/stats/unconfirmed-tx

You can time your transaction for when there is less congestion in the mempool. Fees fall during that time period. Usually this happens on weekends. So during that time you can manually set a low fee and spend your bitcoins.

Before you manually set a low fee please make sure you enable replace by fee. So follow the first two steps here:

https://bitcointalk.org/index.php?topic=1916963.msg19015496#msg19015496

and in addition to the above make sure you check edit fees manually on the fees tab in preferences. This will allow you to both see the dynamic fee options or alternatively enter your own fee manually based on what you see on btc.com.

See some of the suggestions in this thread:

https://bitcointalk.org/index.php?topic=2338968.new;topicseen#new

This is a common problem. Please follow the instructions here:

https://www.reddit.com/r/Electrum/comments/78p9dz/electrum_in_running_in_tails_os_does_not/dovztij/?utm_content=permalink&utm_medium=front&utm_source=reddit&utm_name=Electrum