please help need info on trs22 full insatll, trs22 online install to get trs22 pe up and running really??

so i just brought trainz 22 pe, but it says to download either trs22 full installer or trs 22 online installer, 1st whats the difference. and do i need them to download my game ts22 pe.
2nd, which 1 should i download and why 2 of them, full installer or the online. a little help here please dont know which 1 to pick
 
I use the full installer. It gives me a complete copy that I can archive or store on backup drives. So if my computer crashes, dies or otherwise is replaced, I do not have to spend the time and ISP charges downloading the installer again. But that is purely my preference.
 
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