Gazeta wrote...
is there a way to prevent from usage of addin that was created before given
date?
i want user to be able to use only the last addin i sent him
Not easily. An older add-in would need to know how to check if it were
superceded. That would be rather difficult. If your add-in were being
used by other files you or someone other than your end users designed,
then you could add a udf to the add-in that would return the add-in's
version label. Then your workbooks could call the version udf to check
whether the end user were using the latest version of the add-in, and
if not return errors and display dialogs informing the user of the need
to update the add-in.
If end your users are using your add-in in their own workbooks, then
there's no good way to ensure they're using the latest version other
than to force copies of the latest version onto their machines. That
poses security issues that are off-topic in Excel newsgroups.