Zotero writes it's version into the Windows registry:
HKEY_LOCAL_MACHINE
Path: "SOFTWARE\\WOW6432Node\\Zotero\\Zotero"
Key: "CurrentVersion"
When Zotero updates, this key isn't always updated correctly.
Two examples:
Office PC, Windows 10.
Zotero version is 6.0.10.
Registy version is 5.0.77.
Home PC, Windows 7.
Zotero version is 6.0.10.
Registry version is 6.0.4.
Why is it useful:
Some of our customers doesn't update to Zotero 6.
Therefore we need the Zotero version to send the Integration Command in the old format too.