Ive been trying to install the current version of unity which is 2017.1 and it wont install. It uninstalls the previous version first then fails to uninstall it because it says failed to delete old unity installation files. Maybe unity or some of its tools are still running. Ive searched my running processes and I dont see Unity there. I tried to manually delete unity and it wont delete the folders. I tried to uninstall it from programs and it did uninstall but then it still wants to uninstall it when it installs 2017.1 and gives me the same error… How do I fix this? Im running win 8.1 64 bit
Did you run uninstall/install as administrator? Though if you already started deleting files it could get problematic.
And curiously why didn’t you upgrade to Windows 10?
I have the same exact problem
Give the accounts full control of the Unity folder by right-clicking on folder in Program Files and selecting properties.
Manually delete the Unity folder from Program Files.
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Also make sure you reboot to ensure that Windows releases any handles to DLLs being used. It generally should not be needed, but good to make sure. You can manually safely delete the Unity directory also. It’s also certainly possible to have multiple versions on the same machine, just install into separate directories.
Giving the accounts full control fixed this for me. Thanks @ArachnidAnimal