Gilles,

I forgot to respond importantly to your comment in prior message that I should check "Allow Virtual Products" in the Store Admin module. This is the problem! While I originally noted the existence of that field, I can no longer find it. For example, here are the fields in the Store Admin (Store Info section):

Store Name:
SEO Feature:
Description:
Keywords:
Store Email:
Currency Symbol:
Portal Templates:
Style Sheet:
Store Page:
Store Account Page:
Authorize Cancel:
Inventory Management:
Manage Orders:
Manage Catalog:
Secure Cookie:
Checkout Mode:
Impersonated Account:
Address Provider:
Tax Provider:
Shipping Provider:
Payment Gateway:
Use PayPal Sandbox:
PayPal ID:
Secure ID:
PayPal Verification URL:
PayPal Payment URL:
PayPal Language:
Charset:
PayPal button URL:
Currency:
Surcharge (Percent):
Surcharge (Fixed):
    

I had a theory that perhaps the option is automatically hidden (except upon initial installation?) because I did not previously enable public registration on this portal (i.e. Admin > Site Settings). Perhaps it made sense that if the portal doesn't allow public registration, then virtual products aren't supported. But now I have enabled public registration and I still do not find virtual product capabilities. I am 100% confident that it existed in the original installation, because I noticed that it is not defined in the installation and setup documentation guide, even though I found it on screen.

PS regarding Events module v6.0, I seem to recall that it is only supported for DNN v6+. Due to concerns with using skins that I have modified to support WCAG and XHTML, I haven't taken the plunge into DNN v6.

Best,

Shawn