I am trying to find a safe source to download and install CAxEdit, do you recommend any source?
Caxedit is no longer supported but it appears like the creator's name was Deepak Sathyanarayan. He commented on one of my videos suggesting that he might revive it someday so that doesn't help you in the near term. This is a bit of a precarious spot to be in but I know that a lot of people ask about this, so I'll take the risk for y'all.
Someone has pointed out that you can try to access the download page through web.archive.org and download a 30 day trial of the software? I have not tried this and cannot guarantee anything. So try at your own risk:
Why bother going through so many hoops? Someone had created a Notepad++ plugin for Abaqus input files, which I was able to improve upon with little effort. I think you can do the same for LS-DYNA formatted input decks.
Another option is to quit using Notepad++ altogether - a bit abrupt, I know. I use VIM; it comes with a baked in plug-in for Abaqus which works for LS-DYNA as well. VIM is a beast, works both in Linux and Windows, is non-intuitive and pain in the neck but who doesn't have a personality? 🙂