I've been playing levels for a while and they have always came with their own .exe file (many thanks to the person that came up with this idea). I'm interested in playing some of the older levels that need the level editor to play. I have used The Level Manager but; it only worked once and, since I mistakenly installed a level that didn't require the level editor, it refuses to play any level that I try to install.

What would be the best choice to use to play the older levels ? original TRLE or NGLE ?? Or is there a better one than either of these two ?
I've seen some videos on Youtube about how to use the level editor and I have searched other TR websites (other than this one) for tips.
I'm using Windows7, so I think that compatibility isn't much of an issue.
I've heard that NG level editor is a little buggy and you need some patience (sometimes) to use it. Is this really true ? Have they released a patch (or newer version) for NG level editor ??
Are there options that I don't know about ??
Thank you for your help and/or suggestions in advance. Alfonzo