So... you are dedicated enough to do all this work to join a crappy server ?
Minecraft Beta 1.8.1/Alpha 1.2.6
If you wanna bother to even play this version, here's how to get it and play. (for windows)
Step 1. Download Betacraft launcher (or any other beta version launcher) and click download latest windows version make sure you have the right java runtime for it
Step 2. login to your Microsoft account, go to the prompted microsoft link in the popup and paste it in your browser then copy the code and paste it in the site.
Step 3. Click instances at the top of your Betacraft launcher and create one, name it whatever u want and then click change version, scroll until you find "b1.8.1/a1.2.6" choose it and then you can launch the game
Step 4. download rAdmin by clicking the blue download button in the middle of the website
Step 5. click "Join network" then type "s0zumNetwork" as the Network Name and the password is "BoberOnTop"
Step 6. now you are connected to the rAdmin Network, you can launch Betacraft now and paste the IP in Multiplayer.
Extra Information: if you don't connect, either im not online, or you have a seperate problem that i can try to help fix in discord voice chat. thanks for going through all this work just to play some shitty old minecraft with me, i have a lot of fun with it and i hope you do too !