Hi Emma,
I dont believe you can do this through the Scheduler built into Lansweeeper its not as complexed, one "messy" workaround is within Lansweeper schedule the report to be saved to a file on the server as a Excel say every Monday, then have a Powershell / VBscript script which sends the email with a calculation (https://www.chinhdo.com/20140913/finding-the-last-friday-or-any-weekday-of-the-month/) to only run if the date is correct, via Task Scheduler ?
Messy i know
Cheers
A