Woocommerce Invalid Link Download

Hi,

I have a website with downloadable goods.

Here is the thing, I have thousands of already created ZIP files to upload to the website and I tried with few and tested a sale / download of the file.

Here is the problem I encounter:

When I try to download the file it says Invalid Link – Go to shop.

BUT, when I create another test with fresh created ZIP folder I can download it without any issues.

PROBLEM:

If the file is old even few hours, I can’t download it, but if the file is freshly created and uploaded immediately, I can download it.

How do I fix this so all the files can be downloaded even if ZIP file is older and not fresh created.

It is really weird to me that if the file is an hour old and then uploaded, it says invalid link, while fresh ones are okay. They are all created the same, I tested this so far almost 50 times and every time the outcome is same (fresh file – okay; older file – invalid link).

It appears to be some issue with ZIP file, but I can’t see what can change in an hour.