You can use your original EW 2009 disk to install it on the new computer then download and install the latest patch to version 2.4 for Widows 10 ( link found below). If you no longer have your original disk you can download the installer from the same link. It is the 2009 1.9 Full download. That would need to be installed first, then the 2.4 patch installed.
Then use the activation key you received originally to activate it. If you can't find that key you you would need to either call EW by telephone (+1-918-250-1493) or go to the support page (link below) and open a Support Ticket.
Please note that while EW 2009 will function under Windows 10 with some limitations, it is not fully supported. In fact, support for EW 2009 ended several years ago. See the following article for more information. You really should look into purchasing a new version subscription for full functionality. They no longer sell a one time purchase of EW, only a subscription.
We volunteer at a small church and purchased the disk for easyworship 2009 years ago. We needed to purchase a new computer and have no way to install it. Is there any way to do that without purchasing easyworship again? Thank you