You could do this by creating a formula that adds 1 to a count for each record.  The code would be something like this:

Numbervar Count;
Whileprintingrecords;
count := count +1;
IF count = 11 THEN
    count := 1;

Put this in your details section, and suppress it.

Then, in your Section Expert, add a formula to "New Page After", with code something like

numbervar Count;
Count = 10

This will add a page break after every 10 records (not a new page).  I'm not sure how to add a blank page.... maybe adding a 2nd detail section with the same formula for New Page After?

I haven't tried this so I'm not sure exactly how it'll work but this should hopefully get you going.

One note:  you do not need to add the formula to the Detail Section b.  Instead, add the formula:

numbervar Count;
Count = 10

"New Blank Page After" is in the Section Expert.  Click on the details section where you want to insert a blank page and then choose the option "New Blank Page After".  I have not used the free CR version that you mentioned so really can't tell you if you will have that option.  I would imagine you do tho!!  Good luck.