Seriously, dude... the "errors" you've made with the boot aren't bad at all. You can fix that up with bondo easily. So, you
could keep going with this set if you really wanted to.
But, the thing of it is that most people don't bother with any of the low-res Pep files anymore (well, aside from myself, lol) as there are better-detailed files now available.
I'm sure I wouldn't be the only person who will tell you to switch over to the HD files now rather than later, since you've only just begun with the low-res ones.
Don't get me wrong; the low-res files are good for learning how to do the folding and gluing process properly, but nowadays no one uses those files for making an actual suit. Low-res Pep is only used for practice.
Using the HD files (which have most of the smaller details already put into the design) saves one the trouble of having to add a lot of the details by hand, like I did with my Mk VI helmet.
Take it from one who knows, it's very time-consuming to do all that (I
still haven't finished my helmet), so save yourself any unnecessary work, lol.
Just FYI