Sir what work needs to be tell me and i will do it, just point in the right directions
I think you will run into a huge amount of problems if you are trying to install from scratch.
1. You will need a copy of Debian9 or Debian10 and probably set the repositories archive or similar.
2. You will need to get Debina9/10 packages for FreeSWITCH etc. or work out how to compile FreeSWITCH with all its dependencies under debian9/10
3. You will need to clone the FusionPBX install.sh and hard reset that to a commit at about the right time (my guess would be 5319dc5)
4. You will need to modify the installer so it performs the reset --hard after it clones fusion into your directory.
Maybe you need to ask yourself why you really need Fusion V4.5? Can you achieve what you want another way?
Could you clone and existing v4.5 installation that you have, together with it's OS?