I manage a small company apple computer park and I don't want my users to update to macOS Mojave since one software package we use everyday is not yet compatible.
Is there a way to block the OS update?
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Check this support document:
You can temporarily block any update (to secure for example a shared mac). Use
sudo spctl --disable --label "Mac App Store"
to block any installation from the Mac App Store.
You should create a standard and an admin user and give the standard user credentials.
Using imaging or Net boot is not the recommended approach since the introduction of APFS in macOS High Sierra 10.13.