Here is how to install Garageband in Windows. This method uses a virtual machine on your PC to run a copy of OSX in which you then install Garageband.
Warning, this method contains many steps and is complicated, it could damage your windows installation and if you don’t have experience with virtual machines and are not comfortable with complex software installations then don’t do this. I take no responsibility for corrupted disks, lost files or any loss incurred as a result of implementing the process here. I provide this information as is without any promise of additional support. As such, you take responsibility for troubleshooting or researching fixes for any problems you may encounter.
I successfully completed the installation, however, as an IT professional my machine is top spec (Core i7 16GB Ram 500GB SSD), even so I found that OSX and Logic ran relatively slowly, bottom line, don’t expect top performance from a virtual machine. While still usable, if you’ve ever experienced using a Mac and Garageband natively, you will definitely feel the lag.
This method uses Virtual Box, which is free Virtual Machine software distributed by Oracle:
You will also need your own copy of OSX and some additional files and software detailed in the tutorial. The process requires you to first install virtual box and then complete an installation of OSX, additionally some additional software is required to make the Virtual Machine run smoothly (USB drivers etc).
Once OSX is running you then install Garageband as you would normally on the MAC.
Here are the steps in detail for completing the OSX installation: