Download xmind-portable-3.5.2.201504270119 from official source.

(IMPORTANT!) Run XMind.

Download XMind.Pro.v3.5.0 from BitTorrent.

It should have:

verify_cracked by CodeCracker
net.xmind.verify_3.5.0.201410310637.jar
readme.txt
Serial.Key.txt

Copy net.xmind.verify_3.5.0.201410310637.jar to

xmind-portable-3.5.2.201504270119\Commons\plugins\

Delete the "3.5.2" file and rename "3.5.0" to "3.5.2".

Hashes:
 File: net.xmind.verify_3.5.0.201410310637.jar
CRC-32: 6a9ba350
   MD4: 4e1f6c04e755b02b352f20d9c178342c
   MD5: 2b8766b5619b7d699701b4a4d7358a36
 SHA-1: 59976d1842b7f4a657cd0228503d8c6ef0ef74bf

IMSIDFB49FCE5128BB3E442FEFC640CD8877FBF56FEB8