I tried to upgrade to 2017, but my serial number and/or authorization code were rejected.
I used the ser# and auth. code from 2016. then I chanaged the R in front to an S.
Still didn’t work.
What am I doing wrong?
Pretty much everything. 
You need to get an entirely new license from SketchUp or the reseller if you got it that way. The old license doesn’t work on any other version.
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