is possible to sign a transaction from cold storage 1.9.8 n still broadcast it or need upgrade cold? I would hate to bring it online or make a brand new system for it upgrade so it would be a pain in the ass to spend safely.
As long as your cold storage system has up-to-date balances on your addresses you should be able to still broadcast transactions generated by older versions of Electrum without issue. If it doesn't have up-to-date balances, it may not work. For example, if an address has a zero balance, but your cold storage system says the address still has a 0.01
BTC balance, that transaction won't broadcast because it's invalid (trying to spend funds that are no longer there).