If you update a document in pm. and upload a new version, you will not overwrite the previous version. The previous version remains in pm. and is just "moved to the background". Thus you can download previous versions any time:

1. Go to the "Documents" application, browse to the target folder in the folder tree to the left, where the document is stored and click on it.
2. You can see if a document has several versions with a look at the column "Ver.". 3.0 means that is has 3 versions - the current one and two previous versions.
3. Mark the document in the main application screen.
4. Click on the "Properties" button in the tool bar.
5. Go to the "Files" tab.
6. Here you see a list of all previous versions.
7. In the columns "Date of creation/last change" and "Editor" you can see when and who created the version.
8. Mark the version you like to download.
9. Click on the "Download" button.