You are right that one cant download versions 13 and below anymore. I can guess the reason why you require old versions as I've used Quartus 4, 6, 7, 9, 13, 15, 17 and qualified to give opinion on this. The reason I chose and used FPGAs is based on low-cost and availability. Low-cost also means low-cost dev board which translates to low-cost chips. Hence Arria, Stratix are out of the question. My main reason for using an FPGA is to put my own 32-bit cpu in it which has 64 integer instructions and UART. Thus I've always used the Cyclone series. The best is Cyclone-III which is comparable to Xilinx low-cost series Spartan-3. Cyclone IV, V just an upgrade to III. Lately better FPGA and lower cost still are the Cyclone 10, and MAX10.
Relevant versions and chips tabled below. It can be seen that Quartus 9 supports Cyclone III in the relevant chips. Quartus 17 supports IV, V, 10, MAX10. For relevant chips only these two Quartus are enough. If one does not use Cyclone III anymore then Quartus 17 is enough. Now here is the problem. I've recompiled the CPU from Quartus 9 to Quartus 13, 15, 17 and the same design is excruciatingly slow. I don't know what improvements Altera made but certainly its not an improvement, thats why the board with Cyclone III I reverted back to Quartus 9 which is more than twice faster, reliable, and easier.. all the pros.
For MAX10 I have no choice but to use Quartus 15.
You can still get the Quartus v9 if you can still find the DE0 board from Terasic which uses Cyclone III which it included FOC with the board. Failing that, I can email it to you if there is a way to do it. The file is 1.4 GB.
Quartus Version FPGA
9 32-bit Cyclone I, II, III
13 64-bit Cyclone II, III, IV, V
15 64-bit Cyclone IV, V, MAX10
17 64-bit Cyclone IV, V, 10LP, MAX10