If you don't know how to install it or it doesn't work, the following may help.
If you don't know the download page
You can download it from the download site found in the email with the subject line below that was sent to you at the time of purchase.
[IJCAD] We will deliver the product you ordered (Intelligence Japan)
Alternatively, you can download it from my page on IJCAD.jp.
1. Log in to ijcad.jp.
2. Click "Download latest version" of the desired product from "Download" on My Page.
If you don't know your serial key
Check out the article below.
Reference: How to check the serial key
If an error message is displayed
Check out the article below.
Reference: [Installation] List of error messages
If the installation stops midway
Check out the article below.
Reference: Installation stops midway