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Alteryx workflows and macros are just xml files. Open the .yxmd and .yxmc in notepad and change the second line in each to
<?xml version="1.0"?><AlteryxDocument yxmdVer="2019.1"><Nodes>
Neither of them use 2019.2 specific features so you should be able to open them after this change.
Note. don't try this with the .yxzp file. It's actually a renamed zip file and not comprehensible to mere mortals.