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I will assume you are in a unix environment.

1. Copy your sage to a new directory using something like

   cp -Pr sage-5.5 sage-5.6.beta2

2. Fix the installation in the new directory:

   ./sage-5.6.beta2/sage -c

3. Determine the upgrade path URL. For instance, if you are using the main sage server, then the URL is http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

4. Upgrade the copied directory to the newer version:

   /sage-5.6.beta2/sage -upgrade http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

That should upgrade your sage installation, while keeping the old installation intact. Change the URL to a mirror that is closer to your location so that the download happens faster (we can only hope that it downloads faster, given how crazy the routers work).

I will assume you are in a unix environment.

1. Copy your sage to a new directory using something like

   cp -Pr sage-5.5 sage-5.6.beta2

2. Fix the installation in the new directory:

   ./sage-5.6.beta2/sage -c

3. Determine the upgrade path URL. For instance, if you are using the main sage server, then the URL is http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

4. Upgrade the copied directory to the newer version:

   /sage-5.6.beta2/sage -upgrade http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

That should upgrade your sage installation, while keeping the old installation intact. Change the URL to a mirror that is closer to your location so that the download happens faster (we can only hope that it downloads faster, given how crazy the routers work).

I will assume you are in a unix environment.

1. Copy your sage to a new directory using something like

   cd [one directory above where your sage-5.5 is]

   cp -Pr sage-5.5 sage-5.6.beta2

2. Fix the installation in the new directory:

   ./sage-5.6.beta2/sage -c

3. Determine the upgrade path URL. For instance, if you are using the main sage server, then the URL is http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

4. Upgrade the copied directory to the newer version:

   /sage-5.6.beta2/sage ./sage-5.6.beta2/sage -upgrade http://boxen.math.washington.edu/home/sagemath/sage-mirror/devel/sage-5.6.beta2

That should upgrade your sage installation, while keeping the old installation intact. Change the URL to a mirror that is closer to your location so that the download happens faster (we can only hope that it downloads faster, given how crazy the routers work).

I must add that this kind of update is unsupported. I think only upgrades between release versions are supported.