An open source, self-hosted file share and communication platform.
Download and install the latest portable setup where you want then run nextcloud-portable.exe.
App already installed
If you have already installed Nextcloud from the original setup, do the same thing as a fresh installation and move files :
%LOCALAPPDATA%\Nextcloud\* to data\conf
Run nextcloud-portable.exe and then you can remove Nextcloud from your computer.
For an upgrade, simply download and install the latest portable setup.