Hi @WG910, not yet directly into Webflow, as mentioned by our article about the Assets Panel:
The Assets Panel supports most image file types: PNG - JPEG and JPG - GIF - SVG.
If you have a premium Account plan or your project has an active Hosting subscription, you can also upload six types of document files: PDF - DOC and DOCX - XLS and XLSX - PPT and PPTX - TXT - CSV.
The maximum file size is 4MB for images and 10MB for documents.
Currently, document file uploads are not supported in the CMS or Editor, but will be coming soon.
Another option is store the zip file on an external server and then link to it, i.e if you put the zip file in Dropbox, create a public share link, then link to the zip file via the public share link. You can use any external service you want, if they allow you to create download links.
Webflow does not provide support yet for external links though, so you need to make sure those links stay active on your own.
I hope this helps.