The CRX file itself can be directly downloaded from: https://clients2.google.com/service/update2/crx?response=redirect&prodversion=[PRODVERSION]&acceptformat=c

The CRX file itself can be directly downloaded from: https://clients2.google.com/service/update2/crx?response=redirect&prodversion=[PRODVERSION]&acceptformat=crx2,crx3&x=id%3D[EXTENSIONID]%26uc https://clients2.google.com/service/update2/crx?response=red... [PRODVERSION] is the version of Chrome [EXTENSIONID] is the ID of the extension