1903 Downgrade prevented

Hey I am trying to go back to 1809 but im pretty sure I screwed up and Im gonna need your guys assistance
I bought ssd and had to factory reset by accident.
so I was from 1809 back to 1703 updated to 1709 updated to 1803 then did update to 1903 then some where along the way I reset my pc and then I used the clean installation media and now im stuck on 1903 and I wanna stick with 1809 Any suggestions down for anything don't mind losing my files again I can get them back. just lmk what to do and I would very much gladly appreciate that

Use this tool to download the 1809 ISO file. You want Windows 10 October 2018 update v2 - March 2019. Create an installation USB from the ISO file and clean install 1809. Since you did a clean install of 1903, that's the only way you are going to get 1809.

Here's the tool:
Microsoft Windows and Office ISO Download Tool

do I do it as its my bootable drive as well or ? im kinda confused with this part

- - - Updated - - -

because I just saved 1809 oct v2 x64 iso to my usb and I already formatted my USB
to make sure I have nothing left on there

MrMangoAlt said:

do I do it as its my bootable drive as well or ? im kinda confused with this part

- - - Updated - - -

because I just saved 1809 oct v2 x64 iso to my usb and I already formatted my USB
to make sure I have nothing left on there

You can't boot from a USB drive that has the ISO file just saved to it. You have to actually create a bootable USB flash drive from the iso file:
Create Bootable USB Flash Drive to Install Windows 10 Installation & Upgrade

I highly recommend option 4.

im currently running into a problem where its says volume must be selected very confused it doesn't say that on the instructions
unless I misread them but I don't see it anywhere

- - - Updated - - -
@NavyLCDR Im trying and its just saying im wrong over and over I tried the usb name of it and its size
and its still saying im wrong so the thing doesn't even explain it correctly so could you tell me how to correctly do it

AddRAM said:

Do you still have a windows.old folder ?

No.

AddRAM said:

Did you make a image of your last Operating System with Macrium Reflect ?

No.

I did it but when it was downloading its exact words were
Windows Cannot install required files. The file may be corrupt or missing. Make sure that all files required for installation are available and restart the installation.
Error Code: 0x80070570 @NMI @NavyLCDR @AddRam @ztrucker
I just don't know what to do so im going to download the iso one more time and if it gives me that error im just going to retry the installation with the same exact iso basically just restarting will come back and tell results