On the target machine (no internet):
Silent install (for IT pros):
NDP48-x86-x64-AllOS-ENU.exe /q /norestart
Add /log install.log for troubleshooting. net framework 4.3 offline installer
Even with the correct version, offline installers can fail. Here is how to fix the top three issues. On the target machine (no internet):
A: Install .NET Framework 4.8 offline installer. Unity’s “.NET 4.x Equivalent” label is misleading. 4.8 will run almost all Unity games built for 4.x. Silent install (for IT pros): NDP48-x86-x64-AllOS-ENU
Cause: You are trying to install .NET 4.8 on Windows 7 without required updates.
Fix: Install the latest Windows updates or use an older version like .NET 4.6.2.