Download electrum new version here:

https://electrum.org/#download

Follow these steps to connect ledger and electrum
https://support.ledger.com/hc/en-us/articles/115005161925-Set-up-and-use-Electrum

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Optional but recommended:

It is very likely that you will have to update your ledger nano firm were. Your device will most likely reset, as there is a long time you don't use it.

Only do this if you have the seed with you.

Download ledger live and update the firmware:

https://support.ledger.com/hc/en-us/articles/360002731113-Update-Ledger-Nano-S-firmware