Compressing PDF Not Working

I have an enormous file (159MB contract) from a customer that I've been attempting to compress to no avail. It takes a long time to upload, which is understandable, but when it finishes, I click "compress" and it begins. That, too, takes a little while, but as it finally gets to 99%, instead of completing so I can download, it seems to quit working and the page refreshes to the initial page where you select a file or drag and drop a file you want to compress. So I've attempted to wait this process out 3 times over the last 2 days only to have it just close in the end. Is there anything I can do? This is a bit time-sensitive, so if there is another way to compress the file size so I can review without error or freezing, I'd love to know about it.