@vamsee you can do so by running the same curl commands as in the installation instructions, but substitute master-latest and worker-latest with the desired version.
e.g., for v2.15
curl -L https://get.cryosparc.com/download/master-v2.15.0/$LICENSE_ID -o cryosparc2_master.tar.gz
curl -L https://get.cryosparc.com/download/worker-v2.15.0/$LICENSE_ID -o cryosparc2_worker.tar.gz
And continue with the installation instructions, substituting paths containing cryosparc_ with cryosparc2_ where appropriate