Dear Lydia,
You may have some firewall restrictions. But try to update Collect as the Collect User manual advices:
7.3 UPGRADE COLLECT OFFLINE
1. The easiest way is to update Collect offline is to download the latest updater:
[http://www.openforis.org/nexus/service/local/artifact/maven/redirect?r=releases&g=org.openforis.collect&a=collect-updater-2&v=LATEST&c=windows&e=exe][1]
updater: [Windows][1] / [Linux][2]
2. Stop the Collect Control Panel in offline computer, if running. Wait for 2 minutes.
3. Create a backup copy of your existing Collect installation (c:\OpenForis\Collect folder)
4. Create a backup of the PostgreSQL Collect database (if you are using that as database)
5. Then copy the downloaded file into **c:\OpenForis\Collect\autoupdate** and run it (it must be inside this folder, otherwise it won't find correctly the Collect installation). This process doesn't require administrative rights.
6. Start the Collect and verify that everything works fine
Regards, Lauri
[1]: http://www.openforis.org/nexus/service/local/artifact/maven/redirect?r=releases&g=org.openforis.collect&a=collect-updater-2&v=LATEST&c=windows&e=exehttps://oss.sonatype.org/service/local/artifact/maven/redirect?r=releases&g=org.openforis.collect&a=collect-updater&v=LATEST&c=windows&e=exe
[2]: https://oss.sonatype.org/service/local/artifact/maven/redirect?r=releases&g=org.openforis.collect&a=collect-updater&v=LATEST&c=linux-x64&e=run