No, they do not expire.
Yes, those courses will apply towards your architect certification.
However, you must also take the "Whats new in Splunk 6.2" or 6.3 etc... whatever they have at the time because your original courses were pre 6.2.
I'm looking for a link to a page that tells you how to use 2 years of experience in lieu of many of the other courses. For example you can get knowledge manager and admin certs without taking a single course now. I looked everywhere but couldnt find the website that details this. Your best bet is to email certification@splunk.com and ask them what to do as they know the most. They'll find your old credits and assist you in your cert track moving forward.
