Simply click on the menu command “Help | Online Support | Upgrade to 64-bit version” and follow the instructions. The process takes less than a minute.
Here is a direct download link to the latest 64-bit version (v28.00) of XYplorer. Download and unzip the file, then run XYplorer64_28.00_Install.exe.
The 64-bit version is installed in a different location than the 32-bit version (C:\Program Files\XYplorer versus C:\Program Files (x86)\XYplorer). When you first open the 64-bit version, you can choose to have it inherit your current 32-bit settings (recommended) or start with a fresh, default configuration. Both versions, 32-bit and 64-bit, can be installed and run side by side without problems.
If you have a portable installation, note that the 64-bit version is fully compatible with the 32-bit version's configuration files. Simply overwrite the executable files (XYplorer.exe and XYcopy.exe) to continue working seamlessly.
If you already have a license for the 32-bit version, you don't need a new one. It will just work.
The 64-bit version has several advantages over the 32-bit version:
There are some remaining issues that should be resolved within the next few weeks:
As a temporary workaround, the problems can be significantly improved by changing the properties of XYplorer.exe or the shortcut to it. To do so, right-click on the file or shortcut and select Properties, then open the Compatibility tab and click "Change high DPI settings", then check the "Override high DPI scaling behavior" box and select "System" under "Scaling performed by:".

Check the "Override..." box and select "System".
The workaround has a price, though: the app will look blurry on scaling other than 100%.