Jiri, This doesn't answer you question, but in Coot version 0.8.8 (Robbie is right), the default dictionary generator (if one has access to CCP4) is acedrg. This is, I believe, on the whole, something of an improvement over the version of prodrg that is available from CCP4. There is a mechanism to use prodrg rather acedrg should you wish to do so - let me know if that's really what you want. Paul. On 03/04/17 14:47, Robbie Joosten wrote: > Dear Jiri, > > You don't need to buy anything, but you should update your COOT (stand-alone or with CCP4). The current version is 0.8.8. > > Cheers, > Robbie > >> -----Original Message----- >> From: CCP4 bulletin board [mailto:[log in to unmask]] On Behalf Of >> chemocev marker >> Sent: Monday, April 3, 2017 14:52 >> To: [log in to unmask] >> Subject: [ccp4bb] prodrg in coot >> >> Dear members >> I am wondering how to activate the prodrg tool in coot. Does it has to be >> purchased to get licence??. If I made the ligand in ligand builder and click >> apply, it gives window info no cprogrg not found. I am using the coot 0.8.4 >> from the ccp4 site. Does the enhanced ligand tools has to be purchased?? >> >> best >> >> Jiri