Can I upgrade the OSX V 10.7 Lion to another operational system without risc to lose the instaled programs?

Back up your data, check your applications for compatibility, and try downloading Yosemite from the Mac App Store. If you get told that it's incompatible, your computer can't be upgraded past 10.7.5.

Upgrading the OS always carries the risk of losing data that hasn't been backed up. It isn't possible to foresee all problems associated with this.

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Nothing is without risk. You should never attempt a system upgrade without a full working backup.