MSFS Crash on install

When trying to install MSFS, after the first instalment (the 80.90 GB one), my game crashed and now every time I try to go back into it, it crashes. I have gone to YouTube and watched videos and have done what they said and it hasn’t worked. My pc is well above the requirements, my drivers are updated and I am on the steam version. Would appreciate any help.

Topic moved into #bugs-and-issues:performance for installation problems.