Thanks for the reply!
If I understand correct, .tmp mean, that the blockchain_headers file isn't full downloaded.
I am scared to unistall the wallet and to restore it from seed, because I just checked the seed in my saved txt and see, that I got 13 words. Is it possible to have 13 words instead 12?
At the beginning of Electrum seed contained 12 words,then from 2.0 to 2.6.4 version it have 13 words,and from next version to today it have 12 words again.But you should not to worry because Electrum seed is compatible with all versions,so your 13 words seed should work in last version of Electrum.
You can also make a backup of all files in Electrum folder before you delete them,just in case you need them.If you have some other PC you can try to install Electrum and use your seed in that way.
But before that try option with blockchian_headers file.