i did a protect idefix97.lha +RWED
You don't need to do that.
then the lha_68000 e idefix97.lha on the amiga
That's not really the best way to extract archives with LHA. Here are some instructions right from the start. All commands should be entered without quotes.
1. Download lha.run, Installer-43_3.lha and IDEfix97.lha from Aminet
2. Copy these files exactly as they are in to the RAM: directory on the Amiga
3. Open a shell
4. Enter the command "cd ram:"
5. Enter the command "protect lha.run +rwed"
6. Enter the command "lha.run"
7. Enter the command "copy lha_68020 c:lha" (replace lha_68020 with the correct version for the Amiga's CPU)
8. Enter the command "lha -x x Installer-43_3.lha ram:"
9. Enter the command "copy installer43_3/Installer c:"
10. Enter the command lha -x x IDEfix97.lha ram:"
11. Double click the "Ram Disk" icon
12. Open the "IDE-fix" drawer
13. Double click the "InstallSoftware" icon
Post any errors in full.