Synchronet v3.18b-Win32 (install) has been released (Sept-2020).
Synchronet v3.19a, now under development, requires libarchive-dev to build successfully.
You can donate to the Synchronet project using PayPal.
Customization
Synchronet customization may require some creativity and programming and/or artistic talents. Or you can just apply customizations created by other sysops and developers.