1. You have MT4 EA, but would like to use it on MT5.
reason you do not want to program expert advisor for MT5:
- mql5 programming cost is expensive,
- you have several EAs and rogramming cost is expensive,
- EA has complicated logic.
You can copy trades from MT4 to MT5 with MT4-MT5 trade copier.
2. You would like to buy EA, but it cost over your budget –
share cost with your friend(s) and use trade copier to copy trade on his
3. You have EA with hedging (locking) logic, but your broker