Yes - the exe can be treated as a ZIP file and expanded by an unzip utility, after which you can edit the contents of a data file (eBookUpdater\assets\updaterAssets\PRSVersion.dat - change the version number it thinks it's installing (to a bigger number)) such that it thinks it's going to install a later version than it really will. It doesn't change the version it's installing but it does mean it passes the test that's currently stopping you from upgrading.
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