Hello siempre240,
"My questions:
1 - For how long will this version (1.6.2.46) still be operational?"
At this time I am not aware of a cut off date, currently we support Spybot 1.6.2 and Spybot 2.1
"2 - Knowing that I use only the "immunization" and scan features, what are the weaknesses and/or gaps in this version compared to the new version?"
http://www.safer-networking.org/Spybot - Search & Destroy® is still free for private use but now we also have more advanced products for our home users that include anti virus protection. With our new range of products users can remove annoying startup programs, securely delete files to ensure confidentiality or backup up important registry settings.
http://www.safer-networking.org/2013...rvice-release/
Hope that helps.
Best regards.