Get a copy of 2018 Tax Return

I filed my 2018 tax by CD bought in Costco last year. Now I want to get a pdf copy of my e-file tax return.

 

1.I found the .tax2018 file on my computer.

2.There is no 2018 turbotax software on my computer after I fresh my system.

3.I cannot find the 2018 Premier CD.

 

So I have two questions here:

1.Is there a way to get a 2018 Premier download version in order to read my .tax2018 file and get the pdf copy? I tried to call but the specialist said she cannot help me with that.

2.If I purchase the 2019 Premier CD, I know it can read my .tax2018 file, but can it transfer the .tax2018 file into pdf version?