So I read the report. I thought originally we were talking about the most recent unclassified documents not necessarily the IG report. However I did manage to read the report you linked. I at first thought you were just talking about the Chicago tribune article but then realized you had also linked the IG report.
From what I have read, at every subsection the IG essentially found out that while there were people behaving badly, and some made poor decisions, there was no evidence of coordinated actions that should prosecuted. Since Clinton still seems to be the boogeyman, I'll quote what I think is probably the most salient portion.
Look, I get it, Hillary did a bad dumb thing. After lengthy investigations, no one found an actual crime. It seems that the largest focus of many of these arguments over the improper behavior comes down to "The FBI did not investigate Clinton hard enough. Had they spent more time on her, they likely wouldn't have had time to find actual evidence of crimes committed by the various Trump associates."
I just have a hard time believing there was an actual conspiracy to sweep everything under the rug for Clinton and Obama. Primarily because if such a conspiracy did exist, it would have to of had so many moving parts, that by now someone would have spoken up. That coupled with the fact that had there been an actual conspiracy capable of all of that, why wouldn't they have done something to actually rig the election? Many point to Comey's statement before the election as the turning point that lost Clinton the edge she needed. If the conspiracy truly existed, they could have stopped that. Heck if it actually existed they could have done any number of things to guarantee a win. But they didn't. You might say "Well they were just dumb/incompetent/whatever." I would say that you can't have it both ways. You can't have a dumb or incompetent conspiracy that actually remains a secret. Just look at how long the people surrounding Trump have managed to keep whatever they were up to secret and away from the mueller investigation.