for anyone running into this thread later - there are 3 orthogonal issues here.
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The restsharp conflict- currently, no known issues - it’s just a warning -we’re looking to align with Revit/Forge version (not related to excel).
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Updating dynamoRevit via the daily builds -don’t do this. Sol did a good writeup here about the sandbox builds and why you would use them - A new way to get Dynamo Sandbox - Dynamo BIM
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Excel issues - this sometimes has more to do with the required .net windows feature being turned off over and over again by some group policy or busted excel or office installer (.net programability). Reinstalling excel over and over is the only thing that seems to work - this is one reason we have added new openXML interop nodes that do not require excel to be installed to produce xlsx files.