to be more clear...
I have installed PC electrum BTC wallet and write down several addresses with their private keys and used one of these addresse...
When I installed new version of electrum, the private key for my electrum BTC address has change to invalid one...
When I import my old private key - it show different BTC address with this private key...
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
So you mean after you restore your private keys the bitcoin addresses is different?
Is it a segwit address? just like the same as mine bc1qm37rylgq8rkwdnx66etk9j7dldxksdq8dqrngk
The address you've got is starting from bc1? Its a segwit address its not invalid address.