GCC Venus I Pro

I have so many questions that I am not sure where to start or even if I am supposed to create a new topic for each question, LOL.
I will add all my questions below in numerical order if that helps.

GCC Venus I
I just did a trade for this machine and I am new to this. But I do have over 30 years using Acad but only did my drawings in 2d.
Questions:

  1. How long will a bottle of cO2 at what size bottle?
  2. Will it work with Windows 11, 64bit?
  3. Does GRBL or Lightburn work with?

Twotrees TT-5.5s
Lightburn/Grbl
I have had so much trouble with this machine. Before I Bought the TT-5.5S I had an Ortur back in 2020, but I don’t have anymore.
First problem with TT-5.5S, is that it wouldnt calibrate, it wouldn’t make circles or squares in circles and squares and I tried everything I could read on the forums. Sooo I bought the big gantry that twotrees sells, put it together and for some reason the square are square and circles are circles. Magic? I recently added homing switches to see if it would help with where my laser stops and starts.
Now the rest of the story,

  1. How can I fix to where I dont always have to connect to grbl to change the codes in 21-23 to 1-1-3 and write so it will go to home.
  2. Why want my machine remember where it left off?
  3. Why at times on the same project with the same layer settings cut thru and engrave perfectly and the next time I open the same project the settings are the same but it doesnt cut or engrave like it did the previous time I did the project?

I think I thought of everything and I appreciate the time yall took reading this, I hope it make sense.
Please help a Newbie!

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