Use Help → Report a problem in the app. Type what happened and press Send.
That is the whole of it. You do not need an account, and you do not need to find an email address.
What we receive
Your message, and — only if you tick the box — a short technical summary: the app version, your operating system, your processor type, and your language setting.
That list is exhaustive. We do not receive the document you had open, its contents, its file name, or anything else on your computer. Lumvale PDF does its work on your machine, and the report is the only thing that leaves it.
If you want a reply
There is an optional field for your email address. Leave it blank and the report is anonymous — we will read it, but we cannot answer you.
If you fill it in, we treat the address as unverified: nothing is sent to it automatically, and a person decides whether to reply. That is deliberate. An address typed into a form is not proof that its owner asked us to write to them.
If the report will not send
The app keeps it and tries again. If it still cannot reach us, the report stays on your machine rather than being discarded, and you can send it later or use Help → Contact support to write to us directly.